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  1.  
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. #define MAX_STUDENTS 100
  6.  
  7.  
  8. typedef struct {
  9.     int id;
  10.     char name[50];
  11.     float cse103;
  12.     float mat101;
  13.     float eng101;
  14.     float cgpa;
  15. } Student;
  16.  
  17.  
  18. float calculate_cgpa(float cse, float mat, float eng) {
  19.     float total_credits = 4.5f + 3.0f + 3.0f;
  20.     float weighted_sum = (cse * 4.5f) + (mat * 3.0f) + (eng * 3.0f);
  21.     return weighted_sum / total_credits;
  22. }
  23.  
  24. int main() {
  25.     Student students[MAX_STUDENTS];
  26.     int count = 0;
  27.  
  28.  
  29.     FILE *inputFile = stdin;
  30.     if (inputFile == NULL) {
  31.         printf("Error: Could not open student_input.txt file.\n");
  32.         return 1;
  33.     }
  34.  
  35.  
  36.     while (count < MAX_STUDENTS &&
  37.            fscanf(inputFile, "%d %s %f %f %f",
  38.                   &students[count].id,
  39.                   students[count].name,
  40.                   &students[count].cse103,
  41.                   &students[count].mat101,
  42.                   &students[count].eng101) == 5) {
  43.  
  44.  
  45.         students[count].cgpa = calculate_cgpa(
  46.             students[count].cse103,
  47.             students[count].mat101,
  48.             students[count].eng101
  49.         );
  50.         count++;
  51.     }
  52.     fclose(inputFile);
  53.  
  54.     FILE *outputFile = stdout;
  55.     if (outputFile == NULL) {
  56.         printf("Error: Could not open output.txt file for writing.\n");
  57.         return 1;
  58.     }
  59.  
  60.  
  61.     const char *border = "\n";
  62.  
  63.     printf("%-5s %-10s %-8s %-8s %-8s %-6s\n", "ID", "Name", "CSE103", "MAT101", "ENG101", "CGPA");
  64.     printf("%s", border);
  65.  
  66.     fprintf(outputFile, "%-5s %-10s %-8s %-8s %-8s %-6s\n", "ID", "Name", "CSE103", "MAT101", "ENG101", "CGPA");
  67.     fprintf(outputFile, "%s", border);
  68.  
  69.  
  70.     for (int i = 0; i < count; i++) {
  71.         printf("%-5d %-10s %-8.2f %-8.2f %-8.2f %-6.2f\n",
  72.                students[i].id, students[i].name, students[i].cse103,
  73.                students[i].mat101, students[i].eng101, students[i].cgpa);
  74.  
  75.         fprintf(outputFile, "%-5d %-10s %-8.2f %-8.2f %-8.2f %-6.2f\n",
  76.                 students[i].id, students[i].name, students[i].cse103,
  77.                 students[i].mat101, students[i].eng101, students[i].cgpa);
  78.     }
  79.  
  80.     printf("%s", border);
  81.     fprintf(outputFile, "%s", border);
  82.  
  83.     fclose(outputFile);
  84.     printf("\nSuccessfully processed %d.txt\n", count);
  85.  
  86.     return 0;
  87. }
  88.  
Success #stdin #stdout 0s 5308KB
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stdin
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Standard input is empty
stdout
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ID    Name       CSE103   MAT101   ENG101   CGPA  

ID    Name       CSE103   MAT101   ENG101   CGPA
https://ideone.com/esI89U
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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