[C언어 #15_2] 점수 학점 변환

C언어 점수 학점 변환 (100점 --> A+) 성적 프로그램

터미널로 점수를 문자열로 점수를 입력받아 학점 변환

 

 

Get input score and convert

/* Calculate grade from a score. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdbool.h>
 
// Integer constants representing grades.
enum { A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2, D3, F, Invalid };
 
// Check validity.
bool isValid(int n, const char score[]) {
    bool b = false;
    if (n == 1) b = isdigit(score[0]);
    if (n == 2) b = score[0] != '0' && isdigit(score[0]) && isdigit(score[1]);
    if (n == 3) b = score[0] == '1' && score[1] == '0' && score[2] == '0';
    return b;
}
 
// Convert score string into an integer.
int convert(int n, const char score[]) {
    return isValid(n, score) ? atoi(score) : -1;
}
 
// Convert score into a grade
int grade(int convert) {
    if (convert < 0) return Invalid;
    if (convert < 40) return F;
    if (convert < 45) return D3;
    if (convert < 50) return D2;
    if (convert < 55) return D1;
    if (convert < 60) return C3;
    if (convert < 65) return C2;
    if (convert < 70) return C1;
    if (convert < 75) return B3;
    if (convert < 80) return B2;
    if (convert < 85) return B1;
    if (convert < 90) return A3;
    if (convert < 95) return A2;
    if (convert <= 100) return A1;
}
 
// Print grade result
void print(int grade) {
    if (grade == A1) printf("A+\n");
    if (grade == A2) printf("A0\n");
    if (grade == A3) printf("A-\n");
    if (grade == B1) printf("B+\n");
    if (grade == B2) printf("B0\n");
    if (grade == B3) printf("B-\n");
    if (grade == C1) printf("C+\n");
    if (grade == C2) printf("C0\n");
    if (grade == C3) printf("C-\n");
    if (grade == D1) printf("D+\n");
    if (grade == D2) printf("D0\n");
    if (grade == D3) printf("D-\n");
    if (grade == F) printf("F\n");
    if (grade == Invalid) printf("Invalid Score !!\n");
}
 
// Input score
void getScore(char score[]) {
    printf("Input score: ");
    scanf("%s", score);
}
 
int main() {
    setbuf(stdout, NULL);
 
    // Input score
    char score[10];
    getScore(score);
 
    // Convert and Print result of grade
    print(grade(convert(strlen(score), score)));
    return 0;
}