C For Loop

The for loop is used when you know how many times to repeat. It keeps the start, the condition and the change in one line.

Syntax

for (initialization; condition; update) {
    // code to repeat
}

• initialization runs once at the start.
• condition is checked before each round.
• update runs after each round.

Print 1 to 5

#include <stdio.h>

int main(void) {
    for (int i = 1; i <= 5; i++) {
        printf("%d ", i);
    }
    printf("\n");
    return 0;
}

Output:

Multiplication table

#include <stdio.h>

int main(void) {
    int n = 7;

    for (int i = 1; i <= 5; i++) {
        printf("%d x %d = %d\n", n, i, n * i);
    }
    return 0;
}

Output:

Sum of first 10 numbers

#include <stdio.h>

int main(void) {
    int sum = 0;

    for (int i = 1; i <= 10; i++) {
        sum += i;
    }
    printf("Sum = %d\n", sum);
    return 0;
}

Output:

Counting down and two variables

#include <stdio.h>

int main(void) {
    for (int i = 5; i >= 1; i--) {
        printf("%d ", i);
    }
    printf("\n");

    for (int i = 0, j = 10; i < j; i += 3, j -= 3) {
        printf("i=%d j=%d\n", i, j);
    }
    return 0;
}

Output:

Next: C Nested Loops.

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