Difference between while loop and do while loop

while loop

While Loop is an entry-controlled loop that evaluates the condition before executing the body of the Loop, the body of the Loop will be executed only if the condition is True.

Syntax:

while (condition) {
  // code block to be executed
}

Example:

#include<stdio.h>

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

Output:

1
2
3
4
5

do while loop

A do-while Loop is an exit-controlled loop that evaluates the condition after the execution of the body.

• The body of the Loop is always executed (at least once)
• Once the body is executed, then it checks the condition.

Syntax:

do {
  // code block to be executed
}
while (condition);

Example:

#include<stdio.h>

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

Output:

1
2
3
4
5

Difference between while and do while loop