C loops :

Sometimes we want a C program to repeat something again and again so, a loops is used to make a program do something more than one time.
Loop Types :

for loop

while loop

do-while loop

Comparison of the loop control structures :

for loop	while loop	do-while loop
A for loop is used to execute and repeat a statement block depending on a condition which is evaluated at the beginning of the loop. Example : for(i=1; i<=10; i++) { s = s + i; p = p * i; }	A while loop is used to execute and repeat a statement block depending on a condition which is evaluated at the beginning of the loop. Example : i = 1; while(i <= 10) { s = s + i; p = p * i; i++; }	A do-while loop is used to execute and repeat a statement block depending on a condition which is evaluated at the end of the loop. Example : i = 1; do { s = s + i; p = p * i; i++; } while(i <= 10 )
A variable value is initialized at the beginning of the loop and is used in the condition.	A variable value is initialized at the beginning or before the loop and is used in the condition.	A variable value is initialized at the before the loop or assigned inside the loop and is used in the condition.
A statement to change the value of the condition or to increment the value of the variable is given at the beginning of the loop.	A statement to change the value of the condition or to increment the value of the variable is given inside the loop.	A statement to change the value of the condition or to increment the value of the variable is given inside the loop.