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#include <stdlib.h>
#include <stdio.h>
 
char lettergrade(float numgrade);
 
int main(void)
{
    float numgrade;
    char grade;
 
    printf(" what is your numerical grade? ");
    scanf("%f", &numgrade);
 
    grade = lettergrade (numgrade);
 
    printf("here is your letter grade: %c ", grade);
 
    system("pause");
    return(0);
}
 
char lettergrade(float numgrade)
{
    if (numgrade < 50)
    {
        lettergrade = 'D';
    }
    if (numgrade <= 50 && numgrade < 65)
    {
        lettergrade = 'C';
    }
    if (numgrade <= 65 && numgrade < 80)
    {
        lettergrade = 'B';
    }
    if (numgrade >= 80)
    {
        lettergrade = 'A';
    }
 
    return(0);
}

prog.c: In function ‘lettergrade’:
prog.c:26:21: error: lvalue required as left operand of assignment
         lettergrade = 'D';
                     ^
prog.c:30:21: error: lvalue required as left operand of assignment
         lettergrade = 'C';
                     ^
prog.c:34:21: error: lvalue required as left operand of assignment
         lettergrade = 'B';
                     ^
prog.c:38:21: error: lvalue required as left operand of assignment
         lettergrade = 'A';
                     ^

Standard output is empty