Thread: error if strcmp and getch show that undeclared

My error with line 20 if strcmp and line 75 getch show that undeclared,somebody
can help me.TQ!

Below is my error result:

Code:

#include <stdio.h>

main ()
{
    int credit_hour1,credit_hour2, totalcredithours;
    char fix_grade[3]="A";
    char grade1[3];
    char grade2[3];
    float calculation1, calculation2, totalcalculation,GPA;

    printf("Please enter your Grade for subject_1 :");
    scanf("%s",&grade1);
    printf("Please enter your credit hour for subject_1 :");
    scanf("%d",&credit_hour1);
    printf("Please enter your Grade for subject_2 :");
    scanf("%s",&grade2);
    printf("Please enter your credit hour for subject_2 :");
    scanf("%d",&credit_hour2);

    if(strcmp(grade1,"A" ) == 0)
    calculation1 = 4.00 * credit_hour1;
    if (strcmp(grade1, "A-")== 0)
    calculation1 = 3.67 * credit_hour1 ;
    if(strcmp(grade1,"B+" ) == 0)
    calculation1 = 3.33 * credit_hour1;
    if (strcmp(grade1, "B")== 0)
    calculation1 = 3.00 * credit_hour1;
    if(strcmp(grade1,"B-" )== 0)
    calculation1 = 2.67 * credit_hour1;
    if (strcmp(grade1, "C+")== 0)
    calculation1 = 2.33 * credit_hour1;
    if(strcmp(grade1,"C" ) == 0)
    calculation1 = 2.00 * credit_hour1;
    if (strcmp(grade1, "C-")== 0)
    calculation1 = 1.67 * credit_hour1;
    if(strcmp(grade1,"D+" ) == 0)
    calculation1 = 1.33 * credit_hour1;
    if (strcmp(grade1, "D")== 0)
    calculation1 = 1.00 * credit_hour1;
    if(strcmp(grade1,"F" ) == 0)
    calculation1 = 0.00 * credit_hour1;
    else
      if(strcmp(grade2,"A" ) == 0)
    calculation2 = 4.00 * credit_hour2;
    if (strcmp(grade2, "A-")== 0)
    calculation2 = 3.67 * credit_hour2 ;
    if(strcmp(grade2,"B+" ) == 0)
    calculation2 = 3.33 * credit_hour2;
    if (strcmp(grade2, "B")== 0)
    calculation2 = 3.00 * credit_hour2;
    if(strcmp(grade2,"B-" ) == 0)
    calculation2 = 2.67 * credit_hour2;
    if (strcmp(grade2, "C+")== 0)
    calculation2 = 2.33 * credit_hour2;
    if(strcmp(grade2,"C" ) == 0)
    calculation2 = 2.00 * credit_hour2;
    if (strcmp(grade2, "C-")== 0)
    calculation2 = 1.67 * credit_hour2;
    if(strcmp(grade2,"D+" ) == 0)
    calculation2 = 1.33 * credit_hour2;
    if (strcmp(grade2, "D")== 0)
    calculation2 = 1.00 * credit_hour2;
    if(strcmp(grade2,"F" ) == 0)
    calculation2 = 0.00 * credit_hour2;
    

totalcredithours = credit_hour1 + credit_hour2  ;  
totalcalculation = calculation1 + calculation2 ;
GPA = totalcalculation / totalcredithours ;

 printf("%.2f\n",totalcalculation);  
 printf("%d\n", totalcredithours); 
 printf("GPA %.2f\n", GPA);
    
getch();

}

ok. i try it 1st. tq!