Simple Calculator Application In C

In this video tutorial we shall perform Addition, Subtraction, Multiplication and Division of numbers based on user input.

Related Read:
Basic Arithmetic Operations In C
Addition of 2 Numbers: C
Subtraction of 2 Numbers: C
Multiplication of 2 Numbers: C
Division of 2 Numbers: C
else if statement in C

Simple Calculator Program In C


[youtube https://www.youtube.com/watch?v=QO6pCvM3xSQ]

YouTube Link: https://www.youtube.com/watch?v=QO6pCvM3xSQ [Watch the Video In Full Screen.]


Working of Calculator Program
We display list of operation one can perform. That is,

1. Addition
2. Subtraction
3. Multiplication
4. Division

We ask the user to input his / her choice for arithmetic operation. If the user selects 1, then we ask the user to enter 2 integer numbers to perform addition operation. Once the user enters 2 integer numbers we add and display the result on the screen.

If the user enters wrong choice, we ask the user to enter proper choice.

Student Grade Calculation using else-if clause

 
#include < stdio.h >

int main()
{
    int a, b, choice;

    printf("Enter your choice\n");
    printf("1. Addition\n2. Subtraction\n3. Multiplication\n4. Division\n\n");
    scanf("%d", &choice);

    if(choice > 4)
    {
        printf("You entered wrong choice\n");
    }
    else
    {
        printf("Enter 2 integer numbers\n");
        scanf("%d %d", &a, &b);
    }


    if(choice == 1)
    {
        printf("Addition of %d and %d is %d\n", a, b, (a+b));
    }
    else if(choice == 2)
    {
        printf("Subtraction of %d and %d is %d\n", a, b, (a-b));
    }
    else if(choice == 3)
    {
        printf("Multiplication of %d and %d is %d\n", a, b, (a*b));
    }
    else if(choice == 4)
    {
        if(b != 0)
            printf("Division of %d and %d is %d\n", a, b, (a/b));
        else
            printf("Number can not be divided by 0\n");
    }
    else
    {
        printf("Please enter any of these no 1, 2, 3, 4\n");
    }


    return 0;
}

Output 1:
Enter your choice
1. Addition
2. Subtraction
3. Multiplication
4. Division

1
Enter 2 integer numbers
3
2
Addition of 3 and 2 is 5

Output 2:
Enter your choice
1. Addition
2. Subtraction
3. Multiplication
4. Division

2
Enter 2 integer numbers
8
3
Subtraction of 8 and 3 is 5

Output 3:
Enter your choice
1. Addition
2. Subtraction
3. Multiplication
4. Division

3
Enter 2 integer numbers
5
5
Multiplication of 5 and 5 is 25

Output 4:
Enter your choice
1. Addition
2. Subtraction
3. Multiplication
4. Division

4
Enter 2 integer numbers
10
2
Division of 10 and 2 is 5

Output 5:
Enter your choice
1. Addition
2. Subtraction
3. Multiplication
4. Division

4
Enter 2 integer numbers
0
12
Division of 0 and 12 is 0

Output 6:
Enter your choice
1. Addition
2. Subtraction
3. Multiplication
4. Division

4
Enter 2 integer numbers
10
0
Number can not be divided by 0

Output 7:
Enter your choice
1. Addition
2. Subtraction
3. Multiplication
4. Division

50
You entered wrong choice
Please enter any of these no 1, 2, 3, 4

Note: In division section(that is, choice 4) you can see nesting of if else statement. You can know more about nested if-else statements in this program: Nested if else Statement In C

Note: We can write the same program within while loop and ask the user if he wants to continue working inside calculator application. This avoids the need to exit and re-run the program. We’ll publish the code and video tutorial for the same in coming days. Stay subscribed to our YouTube Channel and blog.

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

      

else if statement in C

In this program we’ll show you the usage of else-if clause in C programming language. Here we are illustrating the concept by taking score/marks of 5 subject from the user. Then we calculate the percentage of it and display grade to the user.

Related Read:
Nested if else Statement In C

Simple Logic: Student Grade

First in if‘s condition we check if the user entered percentage is above 100%. If true – in that case we let the user know that he entered wrong marks and he / she needs to re-enter the marks. Next in first else if we check if the percentage is greater than or equal to 60. Here we need not check if the percentage is less than 100, because in if clause itself we’ve checked if percentage is greater than 100, and we are checking the else if condition only because the condition in if is false. So percentage will be less than 100. Same logic goes to consecutive Grades.

Student Grade Calculation using else if clause: C Program


[youtube https://www.youtube.com/watch?v=WmJEbiKX4BA]

YouTube Link: https://www.youtube.com/watch?v=WmJEbiKX4BA [Watch the Video In Full Screen.]


Note: When the condition is true, it executes its corresponding block of code and then skips checking remaining else if or else conditions.

Note: Its optional to have else in if or else if clause.

Note: We can have any number of else if statements after if.

Student Grade Calculation using else-if clause

 
#include < stdio.h >

int main()
{
    int s1, s2, s3, s4, s5, per;

    printf("Enter marks of 5 subjects\n");
    scanf("%d %d %d %d %d", &s1, &s2, &s3, &s4, &s5);

    per = (s1 + s2 + s3 + s4 + s5) / 5.0;

    if(per > 100)
        printf("You've entered wrong marks, kindly re-enter\n");
    else if(per >= 60)
        printf("Grade A\n");
    else if(per >= 50)
        printf("Grade B\n");
    else if(per >= 40)
        printf("Grade C\n");
    else
        printf("Failed!\n");

    return 0;
}

Output 1:
Enter marks of 5 subject
59
60
62
61
63
Grade A

Output 2:
Enter marks of 5 subject
59
55
56
53
58
Grade B

Output 3:
Enter marks of 5 subject
49
45
46
49
48
Grade C

Output 4:
Enter marks of 5 subject
39
45
25
36
35
Failed!

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

Nested if else Statement In C

In this program we’ll show you nesting of if else statements. Here we are illustrating the concept by taking score/marks of 5 subject from the user. Then we calculate the percentage of it and display grade to the user.

Simple Logic

When the condition in if statement is false then only else block gets executed. In our program, we check, if percentage is greater than or equal to 60. If it is false, then only control shifts to else block. So inside else(nested if else) we need not once again check if the percentage is less than 60.

Note: We are not using else if and logical operator in this C program purposefully. We want to show nesting of if else in this program.

 
#include < stdio.h >

int main()
{
    float s1, s2, s3, s4, s5, per;

    printf("Enter marks of 5 subject\n");
    scanf("%f %f %f %f %f", &s1, &s2, &s3, &s4, &s5);

    per = (s1 + s2 + s3 + s4 + s5) / 5.0;

    if(per >= 60)
    {
        printf("Grade A\n");
    }
    else
    {
        if(per >= 50)
        {
            printf("Grade B\n");
        }
        else
        {
            if(per >= 40)
            {
                printf("Grade C\n");
            }
            else
            {
                printf("Failed!\n");
            }
        }
    }

    return 0;
}

Output 1:
Enter marks of 5 subject
59
60
62
61
63
Grade A

Output 2:
Enter marks of 5 subject
59
55
56
53
58
Grade B

Output 3:
Enter marks of 5 subject
49
45
46
49
48
Grade C

Output 4:
Enter marks of 5 subject
39
45
25
36
35
Failed!

Student Grade Calculation using Nested if else: C Program


[youtube https://www.youtube.com/watch?v=I-EHRu-Nq8o]

YouTube Link: https://www.youtube.com/watch?v=I-EHRu-Nq8o [Watch the Video In Full Screen.]


Note: In next video we’ll show you how to perform the same operation as shown in above C program, using else-if and logical operators.

Also check the program C Program To Check Leap Year for a perfect nested if else example.

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

if else statement in C

In our previous video tutorial we saw how to use the decision control instruction if. In this tutorial we shall see how we can use if else statement in division of 2 numbers example.

We illustrate the use of if else statement in this video tutorial with the help of a division of 2 numbers example program.

Division of 2 Numbers: if else construct in C

Single statement in both if and else block

 
#include < stdio.h >

int main()
{
    int a, b;

    printf("Enter value of a and b for division (a/b)\n");
    scanf("%d%d", &a, &b);

    if( b != 0)
        printf("Division of %d and %d is %d\n", a, b, a/b);
    else
        printf("You can't divide a number by 0\n");

    return 0;
}

Output 1:
Enter value of a and b for division (a/b)
10
2
Division of 10 and 2 is 5

Output 2:
Enter value of a and b for division (a/b)
50
0
You can’t divide a number by 0

Note: When condition for if is true, if block gets executed. When condition in if is false, else block code gets executed.

Multiple statements in both if and else block

 
#include < stdio.h >

int main()
{
    int a, b, c;

    printf("Enter value of a and b for division (a/b)\n");
    scanf("%d%d", &a, &b);

    if( b != 0)
    {
        c = a / b;
        printf("Division of %d and %d is %d\n", a, b, c);        
    }
    else
    {
       printf("You can't divide a number by 0\n");
       printf("Please run the program once again and give proper value\n");
    }


    return 0;
}

Output 1:
Enter value of a and b for division (a/b)
10
2
Division of 10 and 2 is 5

Output 2:
Enter value of a and b for division (a/b)
50
0
You can’t divide a number by 0
Please run the program once again and give proper value

In above example we are enclosing if and else block code in curly braces as both if and else has multiple lines of code or block of code to be executed.

Scanf(): For user input

In above c program we are asking user to enter the values for variable a and b. You can know more about scanf() method/function in this video tutorial: Using Scanf in C Program

if else Construct in C: Division of 2 numbers logic


[youtube https://www.youtube.com/watch?v=WLLJn3hcFa0]

YouTube Link: https://www.youtube.com/watch?v=WLLJn3hcFa0 [Watch the Video In Full Screen.]


This video was produced as building block for our simple calculator application.

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

Division of 2 Numbers: C

In this video tutorial you can learn the procedure followed in C programming to divide two numbers.

 
#include < stdio.h >

int main()
{
    int a, b, c;

    printf("Enter 2 numbers for division\n");
    scanf("%d %d", &a, &b);

    c = a / b;

    printf("Division of %d and %d is %d\n", a, b, c);

    return 0;
}

Output:
Enter 2 numbers for division
10
5
Division of 10 and 5 is 2

You can write same program without using third variable to calculate division of 2 numbers, as below:

 
#include < stdio.h >

int main()
{
    int a, b;

    printf("Enter 2 numbers for division\n");
    scanf("%d %d", &a, &b);

    printf("Division of %d and %d is %d\n", a, b, (a/b));

    return 0;
}

Output:
Enter 2 numbers for division
10
5
Division of 10 and 5 is 2

Note: Instead of int you can take float variables too. That would help in taking both integer as well as real values from the user as input.

Division by 0

What if a user enters 0 for variable b. Any number divided by 0 will give undefined return. So lets handle the scenario using Decision Control Instruction In C: IF and inequality operator.

 
#include < stdio.h >

int main()
{
    int a, b;

    printf("Enter value for a and b, for division (a/b)\n");
    scanf("%d%d", &a, &b);

    if( b != 0 )
       printf("Division of %d and %d is %d\n", a, b, a/b);

    if( b == 0 )
       printf("You can't divide a number by 0\n");

    return 0;
}

Output 1:
Enter value for a and b, for division (a/b)
10
2
Division of 10 and 2 is 5

Output 2:
Enter value for a and b, for division (a/b)
10
0
You can’t divide a number by 0

Output 3:
Enter value for a and b, for division (a/b)
0
5
Division of 0 and 5 is 0

In above program, != is inequality operator. It returns true(non-zero number) if the operands are not equal. == is equality operator. It returns true(non-zero number) if the operands are equal.

Scanf(): For user input

In above c program we are asking user to enter the values for variable a and b. You can know more about scanf() method/function in this video tutorial: Using Scanf in C Program

Division of Two Numbers: C Programming


[youtube https://www.youtube.com/watch?v=QOhDxu0xbY8]

YouTube Link: https://www.youtube.com/watch?v=QOhDxu0xbY8 [Watch the Video In Full Screen.]


This video was produced as building block for our simple calculator application.

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert