uni

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memalloc_ex2.c (1087B)


      1 #include <stdio.h>
      2 #include <stdlib.h>
      3 #include <string.h>
      4 
      5 /*
      6  * Make N student structures, allocate memory for them and
      7  * assign values to them from stdin.
      8  */
      9 
     10 struct Student {
     11         char name[32];
     12         int id;
     13         float grade;
     14 };
     15 
     16 int
     17 main(int argc, char *argv[])
     18 {
     19         struct Student *stud;
     20         int n, i;
     21         float sum;
     22 
     23         do {
     24                 printf("How many students? ");
     25                 scanf("%d", &n);
     26                 getchar();
     27         } while (n <= 0);
     28 
     29         if ((stud = malloc(n * sizeof(struct Student))) == NULL)
     30                 return 1;
     31 
     32         sum = 0.0f;
     33         for (i = 0; i < n; i++) {
     34                 printf("stud[%d].name: ", i);
     35                 fgets(stud[i].name, 32, stdin);
     36 
     37                 printf("stud[%d].id: ", i);
     38                 scanf("%d", &stud[i].id);
     39                 getchar();
     40 
     41                 printf("stud[%d].grade: ", i);
     42                 scanf("%f", &stud[i].grade);
     43                 getchar();
     44 
     45                 sum += stud[i].grade;
     46         }
     47 
     48         printf("avg: %.2f\n", sum / (float)n);
     49 
     50         return 0;
     51 }