How to keep 2 decimal places for integers in C language, just like int a, B and C; a= 1，b=2，c = 3； The average result is 2.00.
When calculating the average value, one of A, B and C is forcibly converted to floating-point type, and two decimal places can be reserved when outputting.
For example:
printf("%.2f "，((float)a+b+c)/3)；
Convert a to float, and the result of the operation is floating point, that is, you can get decimals. Use %.2f when outputting, that is, keep 2 decimal places and output floating-point numbers.