C :

#include<stdio.h>
int main() {
    int n,a,b,c;
    a=0;
    b=0;
    c=0;
while(n>0){
    scanf("%d",&n);
    if(n>=85)
        ++a;
    if(n>=60&&n<85)
        ++b;
    if(n<60)
        ++c;
}
printf(">=85:%d\n",a);
printf("60-84:%d\n",b);
printf("<60:%d\n",c-1);
return 0;
}

C++ :

#include<iostream>
 
using namespace std;
 
int main() {
    int x = 1;
    int success = 0, pass = 0, fail = 0;
 
    while (x > 0) {
        cin >> x;
        if (x >= 85)
            success++;
        else if (60 <= x && 84 >= x)
            pass++;
        else
            fail++;
    }
    cout << ">=85:" << success << endl;
    cout << "60-84:" << pass << endl;
    cout << "<60:" << fail - 1;
 
    return 0;
}