For Loops

Lesson 24
Author : Afrixi
Last Updated : January, 2023

C - Programming Language

This course covers the basics of programming in C.

For loops are used in C to repeat a block of code a specific number of times. The syntax for a for loop in C is as follows:

for (initialization; condition; increment/decrement) {
    // code to be executed
}

Here’s what each part of the for loop does:

initialization: This is where you set the initial value for the loop variable. It is executed once before the loop starts.
condition: This is a boolean expression that is evaluated at the beginning of each iteration of the loop. If it is true, the loop continues. If it is false, the loop ends.
increment/decrement: This is where you update the loop variable at the end of each iteration of the loop. It is executed at the end of each iteration.

Here’s an example of a for loop that prints the numbers from 1 to 10:

for (int i = 1; i <= 10; i++) {
    printf("%d ", i);
}

In this example, i is the loop variable that is initialized to 1, the condition is i <= 10, and i is incremented by 1 at the end of each iteration.

The output of this code will be:

1 2 3 4 5 6 7 8 9 10

You can also use a for loop to iterate through an array. Here’s an example that sums the elements of an array:

int array[5] = {1, 2, 3, 4, 5};
int sum = 0;

for (int i = 0; i < 5; i++) {
    sum += array[i];
}

printf("The sum is %d", sum);

In this example, i is used as the loop variable to index into the array. The condition is i < 5, which ensures that the loop only runs for the length of the array. The loop variable i is incremented by 1 at the end of each iteration. The sum variable is used to accumulate the sum of the elements in the array.

The output of this code will be:

The sum is 15

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