Code:

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

int main() 
{ 
    
    float displayedVal; 
    float newEntry; 
    char sym; 
    
    displayedVal = 0.0; 
    
    printf("   Upisi znak/operator: "); 
    scanf("%c", &sym); 
    while (sym != 'Q' && sym != 'q')
   { 
    switch(sym) 
    { 
               case 'c': 
               case 'C': 
                        displayedVal = 0.0; 
                        break;
               case '+': 
                        printf("   Upisi broj: "); 
                        scanf("%f", &newEntry); 
                        
                        displayedVal +=newEntry; 
                        break; 
               case '-': 
                        printf("   Upisi broj: "); 
                        scanf("%f", &newEntry); 
                        
                        displayedVal -= newEntry; 
                        break; 
               case '*': 
                        printf("   Upisi broj: "); 
                        scanf("%f", &newEntry); 
                        
                        displayedVal *= newEntry; 
                        break; 
               case '/': 
                        printf("   Upisi broj: "); 
                        scanf("%f", &newEntry); 
                        if (newEntry == 0) 
                        { 
                                     printf("\n > Ne mozete dijeliti sa nulom. < "); 
                                     newEntry = 1; 
                        } 
                        
                        displayedVal /= newEntry; 
                        break; 
               default: 
                       printf("\n   Upisali ste pogresan znak"); 
                       break; 
    } 
    printf("\n                                Rezultat = %f\n", displayedVal); 
    printf("   Upisi znak/operator: "); 
    scanf("%c", &sym); 
} 

}