Can some one help me to check why cant my program work. thanks?

#include <stdio.h>
int main(void)
{
double TotalScore = 0,
GPA = 0;
int NoOfSubjects;
int i = 0;
char Grade;

printf( "Enter the number of subjects: " );
scanf( "%d", &NoOfSubjects );

do
{
printf( "Enter the grade ( A, A-, B+, B, B-, C+, C, D, F ): \n" );
scanf( "%c",&Grade );
getchar();

if( Grade == 'A' || Grade == 'a' )
TotalScore = TotalScore + 4.00;
else if ( Grade == 'A-' || Grade == 'a-' )
TotalScore = TotalScore + 3.70;
else if ( Grade == 'B+' || Grade == 'b+')
TotalScore = TotalScore + 3.30;
else if ( Grade == 'B' || Grade == 'b' )
TotalScore = TotalScore + 3.00;
else if ( Grade == 'B-' || Grade == 'b-' )
TotalScore = TotalScore + 2.70;
else if ( Grade == 'C+' || Grade == 'c+' )
TotalScore = TotalScore + 2.30;
else if ( Grade == 'C' || Grade == 'c' )
TotalScore = TotalScore + 2.00;
else if ( Grade == 'D' || Grade == 'd' )
TotalScore = TotalScore + 1.00;
else
printf( "invalid grade\n" );
}
while ( i <= NoOfSubjects, i++ );

Firstly.... You should follow some conventions...

#include <stdio.h>
Should be
#include <cstdio>

And all of these
TotalScore = TotalScore + 4.00;
Should be
TotalScore += 4.00;

It's nicer.



getchar();

^ You're not doing anything with this. Try

Grade = getchar();

:)

Few problems easily identifiable:
1) TotalScore has a COMMA after the command line instead of a semi-colon.
2) Cast a type to GPA, I recommend Double
3) Put a space between the cast and your increment variable "i"
4) Your scanf to get the grade is going to lob off any values after the first character (ie: + / -). "Grade" should be cast as an array of char, captured using %s instead of %c if using scanf.
5) Your incrementer is doing a post inc, meaning if your number of subjects is "1", it will run the loop twice (once for 0 and once for 1).
6) The function is not complete. There is no output, and it's missing the closing brace for the main function.