為什么我的if陳述句檢測不到我的變數？

我正在創建一個程式，它會一直運行，直到你寫“退出”。當您輸入月份時，程式會告訴您月份名稱的順序。例如，我輸入“一月”。程式會說“一月是第一個月。”但是，這不起作用，有時我會收到記憶體參考錯誤。我嘗試將我的scanf() 切換到gets() 和fgets()，并且我還嘗試從scanf() 中洗掉& 符號。這是我的代碼：

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <string.h>

int main(int argc, char**argv)
{


    printf("***Hello!***\n");
    //char monthes[] = {"JANUARY", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december"};

    while(1 < 5)
    {
        char monthName[20];
        printf("Please enter the name of the month: ");
        fgets(monthName, 20, stdin);
        //char a = toupper(monthName);

        if (strcmp(toUpperCase(monthName), "JANUARY") == 0) //1
        {
            printf("January is the first month.");
            printf("This is from the January if statement.");
        }
         else if (strcmp(toUpperCase(monthName), "FEBRUARY") == 0) //2
        {
            printf("February is the second month.");
        }
         else if (strcmp(toUpperCase(monthName), "MARCH") == 0) //3
        {
            printf("March is the third month.");
        }
         else if (strcmp(toUpperCase(monthName), "APRIL") == 0) //4
        {
            printf("April is the fourth month.");
        }
          else if (strcmp(toUpperCase(monthName), "MAY") == 0) //5
        {
            printf("May is the fifth month.");
        }
         else if (strcmp(toUpperCase(monthName), "JUNE") == 0) //6
        {
            printf("June is the sixth month.");
        }
         else if (strcmp(toUpperCase(monthName), "JULY") == 0) //7
        {
            printf("July is the seventh month.");
        }
         else if (strcmp(toUpperCase(monthName), "AUGUST") == 0) //8
        {
            printf("January is the eighth month.");
        }
         else if (strcmp(toUpperCase(monthName), "SEPTEMBER") == 0) //9
        {
            printf("September is the nineth month.");
        }
         else if (strcmp(toUpperCase(monthName), "OCTOBER") == 0) //10
        {
            printf("October is the tenth month.");
        }
         else if (strcmp(toUpperCase(monthName), "NOVEMBER") == 0) //11
        {
            printf("November is the eleventh month.");
        }
         else if (strcmp(toUpperCase(monthName), "DECEMBER") == 0) //12
        {
            printf("December is the twelfth month.");
        }
        else if (strcmp(monthName, "exit") == 0)
            {
            printf("Bye!!!");
            exit(0);
        }
        else
        {
            printf("Unknown month.");
        }
    }

    return 0;
}
void toUpperCase(char word[])
{
    int i = 0;
    char chr;
    while (word[i]) {
        chr = word[i];
        //printf("%c", toupper(chr));
        i  ;
    }
}

uj5u.com熱心網友回復：

您的toUpperCase函式應如下所示：

char *toUpperCase(char *word)
{
    for (int i = 0; word[i]; i  ) {
        word[i] = toupper(word[i]);
    }
    return word;
}

uj5u.com熱心網友回復：

所有好的評論。“while(1 < 5)”是一個有趣的無限回圈結構。功能完善，但通常使用“while (1)”或“for (;;)”。

uj5u.com熱心網友回復：

請注意，假設您對 toUpperCase() 進行了建議的更改，您的“退出”測驗將始終失敗，因為您的 monthName 緩沖區始終轉換為大寫。在第一個“JANUARY”strcmp() 之后沒有必要繼續呼叫它。你需要去掉 fgets() 留下的換行符。

標籤：C if 语句

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