Test calloc() and free() functions by using dynamic memory allocation and filling in random number - C Memory

C examples for Memory:calloc

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Description

Test calloc() and free() functions by using dynamic memory allocation and filling in random number

Demo Code

#include <stdio.h> 
#include <stdlib.h> 
#include <time.h> 
int main()/*  w w  w .j  a  v a  2 s  .  co m*/
{ 
   int response = 3; 
   int *answer; 
   int *op1; 
   int *op2; 
   char *result; 
   int x; 
   srand(time(NULL)); 

   op1 = (int *) calloc(response, sizeof(int)); 
   op2 = (int *) calloc(response, sizeof(int)); 
   answer = (int *) calloc(response, sizeof(int)); 
   result = (char *) calloc(response, sizeof(char)); 
   if ( op1 == NULL || op2 == NULL || answer == NULL || result == NULL ) { 
      printf("\nOut of Memory!\n"); 
      return 1; 
   }  

   for ( x = 0; x < response; x++ ) { 
      op1[x] = rand() % 100; 
      op2[x] = rand() % 100; 
      printf("\n%d + %d = ", op1[x], op2[x]); 
    
      scanf("%d", &answer[x]); 
    
      if ( answer[x] == op1[x] + op2[x] ) 
         result[x] = 'c'; 
      else 
         result[x] = 'i'; 
   } 
   printf("\nQuestion\tYour Answer\tCorrect\n"); 
   for ( x = 0; x < response; x++ ) { 
      if ( result[x] == 'c' ) 
         printf("%d + %d\t\t%d\t\tYes\n", op1[x], op2[x], answer[x]); 
      else 
         printf("%d + %d\t\t%d\t\tNo\n", op1[x], op2[x], answer[x]); 
   } 
   free(op1); 
   free(op2);  
   free(answer); 
   free(result); 
   
   return 0;
}

Result


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