C problemi

#include <stdio.h> 
 int main(){ 
 int secim,i, sayac=0; 
 int adayoy[5]={0}; 
 float oran[5]; 
 while(1){   
   printf("\n[1]Ahmet\n[2]mehmet\n[3]hakan\n[4]aysel\n[5]Merve\n"); 
   printf("Secmek istediginiz adayin Numarasini Giriniz:"); 
   scanf("%d",&secim); 
   switch(secim){ 
     case 1:{ 
     	adayoy[0]=adayoy[0]+1; 
 		break; 
 	}  
     case 2: { 
     	adayoy[1]=adayoy[1]+1; 
     	 
 		break; 
 	} 
     case 3:{ 
     	adayoy[2]=adayoy[2]+1; 
 		break; 
 	}  
     case 4:{ 
     	adayoy[3]=adayoy[3]+1; 
 		break; 
 	}  
     case 5:{ 
     	adayoy[4]=adayoy[4]+1; 
 		break; 
 	}  
 	default :{ 
 		printf("Yanlis Secim...\n"); 
 		sayac-=1; 
 		break; 
 	} 
     } 
   sayac+=1; 
    
    
   for(i=0;i<5;i++){ 
   		oran[i]=adayoy[i]/(float)sayac*100; 
   	 	printf("\n%d inci aday  %.2f oranında oy almis",i+1,oran[i]); 
  	 } 
   } 
  
 return 0; 
 }