C語言練習題：scanf 輸入(C language exercise: input with scanf )

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練習一：大小寫轉換
讓使用者輸入小寫字母，程式轉成大寫字母。
讓使用者輸入大寫字母，程式轉成小寫字母。
Exercise 1: Case converter
Take a lowercase letter from the user and convert it to uppercase letter.
Take a uppercase letter from the user and convert it to lowercase letter.


練習一參考解法：
Exercise 1 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    char letter, small, large;
    printf("Please input a small letter:");
    scanf(" %c", &small);
    letter = small + ('A' - 'a');
    printf("Large letter is %c\n", letter);

    printf("Please input a large letter:");
    scanf(" %c", &large);
    letter = large + ('a' - 'A');
    printf("Small letter is %c\n", letter);
    return 0;
}

練習二：數學式
輸入4個整數a, b, c, d，求出(a + b) * (c + d)的結果。
Exercise 2: Equation
Get four integers a, b, c, d from the user. Calculate (a + b) * (c + d) and show the result.


練習二參考解法：
Exercise 2 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a, b, c, d;
    printf("Please input 4 integer: ");
    scanf("%d%d%d%d", &a, &b, &c, &d);

    printf("(a + b) * (c + d) = %d\n", (a + b) * (c + d) );
    return 0;
}

練習三：華氏溫度
輸入攝氏溫度，程式計算出華氏溫度。公式為 F = C * (9/5) + 32。
Exercise 3: Fahrenheit 
Enter a temperature in Celsius and convert it to Fahrenheit. Formula: F = C * (9/5) + 32.


練習三參考解法：
Exercise 3 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    float celsius, fahrenheit;
    printf("Please input a temperature in celsius:");
    scanf("%f", &celsius);

    fahrenheit = celsius * (9.0 / 5) + 32;

    printf("Celsius:%.2f\tFahrenheit:%.2f\n", celsius, fahrenheit);
    return 0;
}


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