c code for SPI calculation

#include
#include

void main()
{
int i,credit[10],credit1,sum=0,t_credit=0;
float grade[10],num,spi;
char sub[10],name;
clrscr();
for(i=0;i<3;i++) { printf("Enter Name of subject %d :=> ",i);
scanf("%s",&name);
sub[i]=name;
printf("Enter Grade of subject %c :=> ",sub[i]);
scanf("%f",&num);
grade[i]=num;
printf("Enter credit of subject %c :=> ",sub[i]);
scanf("%f",&credit1);
credit[i]=credit;
}
for(i=0;i<3;i++) { sum=sum+(grade[i]*credit[i]); t_credit=t_credit+credit[i]; } spi=(sum)/(t_credit); printf("Spi is :=> %f",spi);
getch();
}