menu, C (gcc) - rextester

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//gcc 5.4.0

#include  <stdio.h>

int main()
{
    int studentID[4]= {4001,4002,4003,5000};
    int exam1[4]={70, 85, 96, 67};
    int exam2[4]={83, 73, 75, 80};
    int exam3[4]={85, 74, 85, 74};
    int exam4[4]={76, 78, 45, 96};
    int menu = 2;
    /*
    for (int i=0; i<4; ++i)
    printf("StudentID: %d\n", i, studentID[i]);
    
    for (int i=0; i<4; ++i)
    printf("exam1: %d\n", i, exam1[i]);
    
    for (int i=0; i<4; ++i)
    printf("exam2: %d\n", i, exam2[i]);
    
    for (int i=0; i<4; ++i)
    printf("exam3: %d\n", i, exam3[i]);
    
    for (int i=0; i<4; ++i)
    printf("exam4: %d\n", i, exam4[i]);
    */
    
    if (menu ==1) {
        for (int i=0;i<4;i++){
            printf("%d %d %d %d %d \n", studentID[i], exam1[i], exam2[i], exam3[i], exam4[i]);
        }
    }
    else if (menu == 2) {
        int id = 4002;
        for (int i=0;i<4;i++){
            if (studentID[i] == id) {
                printf("%d %d %d %d %d \n", studentID[i], exam1[i], exam2[i], exam3[i], exam4[i]);
            }
             
        }
    }  
    else if (menu == 3){
       int id = 4002;
                for (int i=0;i<4;i++)
                    if studentID[i] == id){
                    int average;
                    average= ((exam1[i]+exam2[i]+exam3[i]+exam4[i])/4)
                
              
                }
   }   
   return 0;
}

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Compilation time: 0 sec, absolute service time: 0,01 sec