rectify the error that the program accepts a marks of a student M and prints A grade if the marks between 90 and 100.else the program prints not a grade as the output code example

Example: Write a program that inputs test scores of a student and display his grade

#include <stdio.h>
int main(void){
int num;
printf("Enter your mark ");
scanf("%d",&num);
printf(" You entered %d", num); // printing outputs

	if(num >= 80){
	printf(" You got A grade"); // printing outputs
		}
	else if ( num >=60){ // Note the space between else & if
		printf(" You got B grade");
		}
	else if ( num >=40){
		printf(" You got C grade");
		}
	else if ( num < 40){
		printf(" You Failed in this exam");
		}
return 0;
}