Well, you could streamline it a bit like:
Code:
#include <stdio.h>
char letter;
char line[100];
int grade;
int main()
{
while (1) {
printf("Enter the numeric grade\n");
printf(" or 0 to stop:");
fflush(stdout);
fgets(line, sizeof(line), stdin);
sscanf(line, "%d", &grade);
if(grade > 0 && grade <= 60)
letter = 'F';
else if
(grade <= 70)
letter = 'D';
else if
(grade <= 80)
letter = 'C';
else if
(grade <= 90)
letter = 'B';
else if
(grade <= 100)
letter = 'A';
else break;
printf("%c\n", letter);
}
return (0);
}
But yeah, looks good for newb code.