error if strcmp and getch show that undeclared

This is a discussion on error if strcmp and getch show that undeclared within the C Programming forums, part of the General Programming Boards category; My error with line 20 if strcmp and line 75 getch show that undeclared,somebody can help me.TQ! Below is my ...

  1. #1
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    Cool 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();
    
    }

  2. #2
    and the hat of int overfl Salem's Avatar
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    strcmp is in string.h
    getch is in conio.h, you should read the FAQ for better ways of stopping the window disappearing when the program ends.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
    C++まいる!Cをこわせ!
    Join Date
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    Posts
    23,031
    This is C. Perhaps you should use a C compiler and put it in the C section.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  4. #4
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    ok. i try it 1st. tq!

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