Post-increment and Pre-increment Operator: C Program

In this video tutorial we show the differences and working of post-increment and pre-increment operators.

Note: In pre-increment, first the value of the variable is incremented after that the assignment or other operations are carried. In post-increment, first assignment or other operations occur, after that the value of the variable is incremented.

Post-increment and Pre-increment Operator: C Program

Pre-increment Operator: C Program

#include < stdio.h >

int main()
{
    int a = 10, b;

    b = ++a;

    printf("b = %d\n\n", b);
    printf("a = %d\n", a);

    return 0;
}

Output:
b = 11
a = 11

Here first the value of a increments and then is assigned to variable b. So both a and b value will be 11.

#include < stdio.h >

int main()
{
    int a = 10;

    printf("a = %d\n\n", ++a);
    printf("a = %d\n", a);

    return 0;
}

Output:
a = 11
a = 11

Here in the first printf statement a value gets incremented and then printed out.

Post-increment Operator: C Program

#include < stdio.h >

int main()
{
    int a = 10, b;

    b = a++;

    printf("b = %d\n\n", b);
    printf("a = %d\n", a);

    return 0;
}

Output:
b = 10
a = 11

Here first value of a(i.e., 10) is assigned to b and then value of a is incremented. So b = 10 and a = 11 is printed.

#include < stdio.h >

int main()
{
    int a = 10;

    printf("a = %d\n\n", a++);
    printf("a = %d\n", a);

    return 0;
}

Output:
a = 10
a = 11

Here in the first printf statement a value gets printed after that its value gets incremented, which is shown in second printf statement.

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