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for loops basically is used when developer knows number of iterations to be performed is known already : Example : printing table of 10 up to 10 i.e 10 * 10=100 we know number of iteration=10 so for loop can be used for(i=1;i<=10;i++){ printf("%d \n",i); // already knew iteration=10 so for loop } WHILE loop on other hand is used if developer s not sure or uncertain about number of iterations prior. Example C program to reverse the number : here number n can be anything inputted by user so developer is not sure about number of iteration so while loop while(n != 0) { remainder = n%10; reversedNumber = reversedNumber*10 + remainder; n /= 10; } we can solve this by using for loop also but it is recommended if number of itertion not know use WHILE else if known then FOR.