A calculation problem in c

[Citrons]

Contributions wont calculate

#include <stdio.h> 
#include <conio.h> 
int main() 
{ float tax;
 float salary;
 float taxable;
 float taxmo;
 float contributions;
 float pension;
 float ni;
 float pensionmo;
 float nimo;
 printf("Please Enter Gross Salary\n");
 scanf("%f", &salary);
 contributions = 6/100*salary + 2/100*salary;
 taxable = salary - contributions;
 if (taxable <= 4000) { tax = 0 ; } else { tax = 0;

[weaknessforcats]

This code:

contributions = 6/100*salary + 2/100*salary;

6/100 is 0. 2/100 is 0. 0 times anything is 0.

Remember, with ints, 100 goes into 6 zero times.

You might try to ue 6.0f/100.0f and 2.0f/100.0f.
The f tells the compiler to create the constants as float because 2.0 by default is a double. A double is larger than a float so you starting getting "possible loss of data" warnings from the compiler if you try to put a double into a float.

Personally, would use 2.0/100.0 and chnage all thse floats to double.