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#include <stdio.h>
 
int i, num, gpa, GPAFreq[4];
   printf ("Enter the number of students: ");
   scanf ("%d", &num);
   if (num <= 0) {
      printf ("Invalid number!\n");
      return 0; 
   }
   for (i=1; i <=num ; i++) {
      printf ("GPA of student #%d is: ", i);
      scanf ("%d", gpa);
      switch (gpa) {
         case 1: GPAFreq[0]++; break;
         case 2: GPAFreq[1]++; break;
         case 3: GPAFreq[2]++; break;
         case 4: GPAFreq[3]++; break;
         default: printf ("Invalid number! \n"); i--; break;   
      }
   }
 
   printf ("The total number of student is %d.\n", num);
   printf ("GPA 1 --- %d student(s)\n", GPAFreq[0]);
   printf ("GPA 2 --- %d student(s)\n", GPAFreq[1]);
   printf ("GPA 3 --- %d student(s)\n", GPAFreq[2]);
   printf ("GPA 4 --- %d student(s)\n", GPAFreq[3]);
 
   return 0;
 

prog.c:4:12: error: expected declaration specifiers or ‘...’ before string constant
    printf ("Enter the number of students: ");
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:5:11: error: expected declaration specifiers or ‘...’ before string constant
    scanf ("%d", &num);
           ^~~~
prog.c:5:17: error: expected declaration specifiers or ‘...’ before ‘&’ token
    scanf ("%d", &num);
                 ^
prog.c:6:4: error: expected identifier or ‘(’ before ‘if’
    if (num <= 0) {
    ^~
prog.c:10:4: error: expected identifier or ‘(’ before ‘for’
    for (i=1; i <=num ; i++) {
    ^~~
prog.c:10:16: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘<=’ token
    for (i=1; i <=num ; i++) {
                ^~
prog.c:10:25: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘++’ token
    for (i=1; i <=num ; i++) {
                         ^~
prog.c:22:12: error: expected declaration specifiers or ‘...’ before string constant
    printf ("The total number of student is %d.\n", num);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:22:52: error: expected declaration specifiers or ‘...’ before ‘num’
    printf ("The total number of student is %d.\n", num);
                                                    ^~~
prog.c:23:12: error: expected declaration specifiers or ‘...’ before string constant
    printf ("GPA 1 --- %d student(s)\n", GPAFreq[0]);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:23:41: error: expected declaration specifiers or ‘...’ before ‘GPAFreq’
    printf ("GPA 1 --- %d student(s)\n", GPAFreq[0]);
                                         ^~~~~~~
prog.c:24:12: error: expected declaration specifiers or ‘...’ before string constant
    printf ("GPA 2 --- %d student(s)\n", GPAFreq[1]);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:24:41: error: expected declaration specifiers or ‘...’ before ‘GPAFreq’
    printf ("GPA 2 --- %d student(s)\n", GPAFreq[1]);
                                         ^~~~~~~
prog.c:25:12: error: expected declaration specifiers or ‘...’ before string constant
    printf ("GPA 3 --- %d student(s)\n", GPAFreq[2]);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:25:41: error: expected declaration specifiers or ‘...’ before ‘GPAFreq’
    printf ("GPA 3 --- %d student(s)\n", GPAFreq[2]);
                                         ^~~~~~~
prog.c:26:12: error: expected declaration specifiers or ‘...’ before string constant
    printf ("GPA 4 --- %d student(s)\n", GPAFreq[3]);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:26:41: error: expected declaration specifiers or ‘...’ before ‘GPAFreq’
    printf ("GPA 4 --- %d student(s)\n", GPAFreq[3]);
                                         ^~~~~~~
prog.c:28:4: error: expected identifier or ‘(’ before ‘return’
    return 0;
    ^~~~~~

Standard output is empty