Loops in C

C 149 views Dec 22, 2025 1 min read

Loops are used to execute a block of code repeatedly as long as a specified condition is true.

Types of Loops in C

Used when the number of iterations is known.

for (initialization; condition; increment/decrement) {
    statements;
}

for (int i = 1; i <= 5; i++) {
    printf("%d ", i);
}

Used when the condition is checked before execution.

while (condition) {
    statements;
}

int i = 1;
while (i <= 5) {
    printf("%d ", i);
    i++;
}

Used when the loop must execute at least once.

do {
    statements;
} while (condition);

int i = 1;
do {
    printf("%d ", i);
    i++;
} while (i <= 5);

Feature	for	while	do–while
Condition check	Before loop	Before loop	After loop
Minimum execution	0 times	0 times	At least 1 time
Use case	Known count	Unknown count	Execute once minimum

Terminates the loop.

break;

Skips the current iteration.

continue;

A loop inside another loop.

for (int i = 1; i <= 3; i++) {
    for (int j = 1; j <= 3; j++) {
        printf("* ");
    }
    printf("\n");
}

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