Thread: Void Function

Hello I have been encountering some problems with my void function coding. When I enter my three values the command prompt just stops and nothing happens, I would appreciate any advice thanks.

Code:

#include <stdio.h>
#include <stdlib.h>


/* run this program using the console pauser or add your own getch, system("pause") or input loop */


void repayments(float, float, float); // function prototype


int main() 
{
    float cost, deposit, interest_rate;
    
    // get values from user


    do
    {
     printf("Enter the cost of the car:\n");
    scanf("%f", &cost);
      if (cost <= 0)
    printf("ERROR: the cost must be higher than 0\n");
      }
    while(cost <= 0);


    do
    {
      printf("Enter the deposit paid:\n");
      scanf("%f", &deposit);
    if (deposit <= 0 || deposit > cost)
    printf("ERROR: the deposit can't be less than or equal to 0 or greater than cost\n");
    }
    while(deposit <= 0 || deposit > cost);


    do
    {
    printf("Enter the interest rate:\n");
    scanf("%f", &interest_rate);
    if (interest_rate < 0 || interest_rate > 100)
    printf("ERROR: Interest rate must be between 1 and 100\n");
    }
    while(interest_rate < 0 || interest_rate > 100);
    
    repayments(cost, deposit, interest_rate); // function call with 3 arguments
    
    return 0;
}


void repayments(float c, float d, float ir) // function header
{
    short int i; // local variable
    
    for(i = 1; i <= 5; i+12); // 5 iterations - 12, 24, 36, 48, 60
    {
        printf("Your repayment after %hd months is %f\n" , i+12, ((c - d)/i+12)*(ir));
    }
    
    return;
}