The for loop: Most of the time only few programmers use while loop as they are too busy using the for loop. The for allows us to specify three thing about a loop in a single line: Setting a loop counter to an initial value. Testing the loop counter to determine whether it's value has reached the number of repetition desired. Increasing the value of loop counter each time the body of the loop has been executed. General for of for statement: for(initialize counter;test counter;increment counter) { do this; and this; and this; } Example program: /*Calculation of simple interest for 3 sets of p, n and r*/ #include<stdio.h> int main() { int p,n,count; float r,si; for(count=1;count<=3;count=count+1) { printf("Enter values of p,n and r"); scanf("%d%d%f,&p,&n,&r"); si=p*n*r/100; printf("Simple Interest=Rs.%f\n",si"); } return 0; } Explanation: When the for statement is exe...