C program not running but getting compiled with no errors

Question

this is the program in question:

#include <stdio.h>
#include <tgmath.h>
#include <simpio.h>

long main(){
    long cars_t,years;
    cars_t=80000;
    years=0;
    while (cars_t<=160000){
        cars_t=ceil(cars_t*(1+7/100));
        years+=1;
    }
    printf("Xronia:%ld\n",years);
    printf("Arithmos Autokinhton:%ld\n",cars_t);
}

Just an extremely simple program with a while function. But for some reason it doesn't give any output at all. What i have noticed however is that, the moment i remove the while function(and the code inside of it) the program runs perfectly fine. Can anyone tell me how to fix this? thanks in advance.

Answer 1

This is because you have declared cars_t as an integer (long) value, and 7/100 which are also also integers and so evaluate to zero. Hence you get stuck in the loop as cars_t does not increase.

Instead you want cars to be a floating value and force 7/100 to be evaluated as floating:

#include <stdio.h>
#include <tgmath.h>

long main(){
    long years;
    double cars_t;
    cars_t=80000;
    years=0;
    while (cars_t<=160000){
        cars_t=ceil(cars_t*(1+7.0/100));
        years+=1;
    }
    printf("Xronia:%ld\n",years);
    printf("Arithmos Autokinhton:%lf\n",cars_t);
}

https://onlinegdb.com/vNusyZ9xD