如果語句問題，不顯示正確的輸出

Question

我想做一個程序，讓用戶選擇從他們想要轉換的度量列表中進行選擇。
到目前爲止，我的代碼，我已經是：

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

int main() 
{ 
    int sv, SourceUnit, du, mb, kb, by; 
    printf("--------------------------------------------------0x0 Menu:------ ---------------------------------\n"); 
    printf(" Please Select from the following options (enter number exactly when prompted for source units!\n"); 
    printf("1: Kilo -> Mega\n2: Mega -> Kilo\n10. Bits -> Bytes\n "); 
    printf("--------------------------------------------------------------------------------------------------\n"); 

    printf("Enter source value: "); 
    scanf("%d", &sv); 

    printf("Enter source unit: "); 
    scanf("%s", &SourceUnit); 

    if (SourceUnit == 1)               //convert kilobytes to megabytes 
    { 

     mb = (sv/1024); 
     printf("%d Kb == %d Mb\n", sv, mb); 
    } 

    else if (SourceUnit == 2)               //convert megabytes to kilobytes 
    { 
     kb = (sv/1024); 
     printf("%d Mb == %d Kb\n", sv, kb); 
    } 

    else if (SourceUnit == 10)               //bits to bytes 
    { 
     by = (sv/8); 
     printf("%d Bits == %d Bytes\n", sv, by); 
    } 

    else 
    { 
     printf("Please Choose from the menu options to convert!\n"); 
    } 

    return(0); 
} 

它編譯於GCC罰款。我得到的輸出是：

---------------------------------------0x0 Menu:---------------------------- 
1. Kilo -> Mega 
2. Mega -> Kilo 
3. Bits -> Bytes 
---------------------------------------------------------------------------- 
Enter Source Value: (Example I will type in 30 for the number to be converted) 30 
Enter Source Unit: (Example will be 1 to convert from Kilo to Mega) 1 
Please Choose from the menu options to convert! 

出於某種原因，我else語句顯示出來的時候，我不希望它to..what導致這個錯誤？

此外，我有一些問題，我需要將德卡轉換爲dibi ..如何完全可以做到這一點？ 我知道一個deka是一個10的組，而一個dibi是一個16的組，但這是我可以讀取的所有信息。

Answer 1

您的scanf格式說明符錯誤。它應該是「％d」。這導致了這個問題。

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

int main() 
{ 
    int sv, SourceUnit, du, mb, kb, by; 
    printf("--------------------------------------------------0x0 Menu:------ ---------------------------------\n"); 
    printf(" Please Select from the following options (enter number exactly when prompted for source units!\n"); 
    printf("1: Kilo -> Mega\n2: Mega -> Kilo\n10. Bits -> Bytes\n "); 
    printf("--------------------------------------------------------------------------------------------------\n"); 

    printf("Enter source value: "); 
    scanf("%d", &sv); 

    printf("Enter source unit: "); 
    scanf("%d", &SourceUnit); //This should be %d 

    if (SourceUnit == 1)               //convert kilobytes to megabytes 
    { 

     mb = (sv/1024); 
     printf("%d Kb == %d Mb\n", sv, mb); 
    } 

    else if (SourceUnit == 2)               //convert megabytes to kilobytes 
    { 
     kb = (sv/1024); 
     printf("%d Mb == %d Kb\n", sv, kb); 
    } 

    else if (SourceUnit == 10)               //bits to bytes 
    { 
     by = (sv/8); 
     printf("%d Bits == %d Bytes\n", sv, by); 
    } 

    else 
    { 
     printf("Please Choose from the menu options to convert!\n"); 
    } 

    return(0); 
}