The if statement within the body of the for loop is used to print a comma after each value of the loop variable except the last one.
Consider the code given below to print a comma-separated list of numbers from 1 to 10:
printf("Print a comma-separated list of numbers from 1 to 10 :\n");
for (i = 1; i <= 10; i++)
if (i < 10)
The output of a program containing this code is shown