GPA電卓をCコード

Question

私はこのプログラムを設計しようとしていますが、これは常に間違った等級入力エラーを誰にも私はどこでエラーを見つけるのを助けることができますか？ 誰かが私の間違いを見て、正しい方向に私を押し込むことはできますか？私は誰の時間とアドバイスに感謝:)

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
    int main() { 
     char str[100], ch; 
     int i, grade[20]; 
     int p; 
     float credit[20], gpa = 0.0, totCredit = 0.0; 

     printf("SIKKIM MANIPAL INSTITUTE OF TECHNOLOGY\nMajhitar, Rangpo - 737136\n\nGPA CALCULATOR \n\n"); 
     printf("PROGRAM CREATED BY: SHAMSH SAMEED ASHAN\n"); 
     printf("FOR ANY INFO PLEASE CONTACT +91-9083454677\n\n"); 
     printf("------*------*------*-----*------*------*------*------*------*------*------*------*------*------\n\n"); 
     printf("NOTE:\n\n"); 
     printf("1. Enter Grades in CAPITALS \n"); 
     printf("2. Enter Grade and credit for the subjects in the following format:\n"); 
     printf(" Example: |Subject 'n' (Grade|Credit):S4 |(If you enter S4 Here S is the grade and 4 is the credit)\n"); 
     printf("3. If you have got 'F' grade then enter F followed by credit for that subject. \n 'F' grade subjects will not be used in calculation.\n\n"); 
     printf("Enter Grade & Credits for each subject:\n\n"); 
     printf("------*------*------*-----*------*------*------*------*------*------*------*------*------*------\n\n"); 
     printf("Enter number of subject:"); 
     scanf("%d",&p); 
     /* get the letter grade and credits from the user */ 
     for (i = 0; i < p; i++) { 
       printf("Subject %d(Grade|Credit):", i + 1); 
       ch = getchar(); 
       grade[i] = ch; 
       scanf("%f", &credit[i]); 
       getchar(); 
     } 

     /* print the input grades and credits */ 
     printf("\nSubject | Grade | Credit\n"); 
     for (i = 0; i < p; i++) { 
       printf(" %d | %c | %.1f\n", i + 1, grade[i], credit[i]); 
     } 

     /* calculate gpa value */ 
     for (i = 0; i < p; i++) { 
       switch (grade[i]) { 
         case 'S': 
           gpa = gpa + 10 * credit[i]; 
           totCredit = totCredit + credit[i]; 
           break; 
         case 'A': 
           gpa = gpa + 9 * credit[i]; 
           totCredit = totCredit + credit[i]; 
           break; 

         case 'B': 
           gpa = gpa + 8 * credit[i]; 
           totCredit = totCredit + credit[i]; 
           break; 

         case 'C': 
           gpa = gpa + 7 * credit[i]; 
           totCredit = totCredit + credit[i]; 
           break; 

         case 'D': 
           gpa = gpa + 6 * credit[i]; 
           totCredit = totCredit + credit[i]; 
           break; 

         case 'E': 
           gpa = gpa + 5 * credit[i]; 
           totCredit = totCredit + credit[i]; 
           break; 

         case 'F': 
           gpa = gpa + 0 * credit[i]; 
           totCredit = totCredit + credit[i]; 
           printf("\nNOTE: F Grade SUBJECTS will not be used in calculation.\n"); 
           break; 

         default: 
           printf("WRONG GRADES FORMAT ENTERED\n PLEASE ENTER GRADES IN CAPITAL LETTERS!!\n\n"); 
           exit(0); 

       } 
     } 
     printf("Total GPA: %.1f\tTotal Credit: %.1f\n", gpa, totCredit); 
     gpa = gpa/totCredit; 
     printf("Your GPA: %.2f\n", gpa); 

     printf("\nPress ENTER a few times to terminate the program"); 
     fflush(stdout); 
     getchar(); getchar(); 
     return 0; 
    } 

Answer 1

ch = getchar(); 

これはSTDINから次の文字を取得します。数字の直後に手紙を入力しない限り（たとえば、件名の入力を求められたときに2Aと入力すると）\nとなります。あなたはこのような文字読むことができます空白をスキップする

：

scanf(" %c", &ch); 

を初期スペースが、それは空白をスキップして、最初の非空白文字を読むようになります。