(05.23.23) Practice 1

#include<stdio.h>
int main(){

   //defining all the parameters we need	
   int marks[6];
   int total,num;
   struct students{
        struct name{char firstname[20]; char secondname[20];} n;
        int rollnum;
        char fathername[20];
        char mothername[20];
        int contactnum;
        int sem1sgpa ;
        int sem2sgpa ;
        int cgpa     ;} s[85];

   //making a loop to get info
   printf("How many students are in your class? \n");
   scanf("%d",&num);
  
   for(int i=0; i<num; i++){
	   printf("Please enter student's name:\n");
           scanf("%s %s",s[i].n.firstname,s[i].n.secondname);		   
           printf("Please enter student's roll number:\n");
	   scanf("%d",&s[i].rollnum);
           printf("Please enter student's father's name:\n");
           scanf("%s",s[i].fathername);
	   printf("Please enter student's mother's name:\n");
           scanf("%s",s[i].mothername);
           printf("Please enter student's emergency contact number:\n");
           scanf("%d",&s[i].contactnum);};
 
   //calculating sgpa
    for(int i=0; i<num; i++){
   	    for(int j=0; j<6; j++){
		   printf("Please enter marks for subject %d for student %d\n",j+1,i+1);
		   scanf("%d",&marks[j]);
		   if (marks[j]>100||marks[j]<0){
			   printf("-----Enter a valid mark between 0 & 100-----\n");
			   j= j-1;};};
		   total = marks[0]+marks[1]+marks[2]+marks[3]+marks[4]+marks[5];
           s[i].sem1sgpa= total/(6*10) ;
           s[i].cgpa = s[i].sem1sgpa;
           //initialising total
	   total=0;   };

   //outputting the structure
   for(int i=0; i<num; i++){
	   printf("The student's name is %s %s.\nRoll Number:%d \nFather's name:%s \nMother's name:%s \nEmergency contact number:%d \nSGPA for Semester 1:%d \nSGPA for Semester 2:%d \nCGPA:%d\n", s[i].n.firstname,s[i].n.secondname,s[i].rollnum, s[i].fathername,s[i].mothername,s[i].contactnum,s[i].sem1sgpa,s[i].sem2sgpa,s[i].cgpa);};}