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C語言練習題：條件判斷(C language exercise: If Condition)

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練習一：入學許可
如果您的在校成績有高於80分，就可以申請自己第一志願的大學。現在請設計一程式可讀取使用者的在校成績，若使用者可以申請第一志願的大學就輸出「YES」，否則輸出「NO」。

Exercise 1: College Admission
If you got GPA higher than 4.0 in transcript then you can apply for  your first choice. Now write a C program read GPA from the keyboard and print "YES" if you can apply otherwise print "NO".

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

int main()
{
    float gpa;
    printf("Please enter your GPA:");
    scanf("%f", &gpa);

    if(gpa < 4.0)
        printf("NO\n");
    else
        printf("YES\n");

    return 0;
}


練習二：APCS成績級分
撰寫一個可輸入APCS成績的C語言程式，此程式會依據下表輸出對應的級分。

級分

分數範圍

五

90~100

四

70~89

三

50~69

二

30~49

一

0~29

Exercise 2: C Programming GPA

Write a C program that gets C Programming score from the user. Then print the grade depending on the given scale(See the following table).

Grade

Scale

A

90~100

B

70~89

C

50~69

D

30~49

F

0~29

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

int main()
{
    int apcsScore;
    printf("Enter your C programming score:");
    scanf("%d", &apcsScore);

    printf("Grade:");
    if(apcsScore >= 90)
        printf("A");
    else if(apcsScore >= 70)
        printf("B");
    else if(apcsScore >= 50)
        printf("C");
    else if(apcsScore >= 30)
        printf("D");
    else if(apcsScore >= 0)
        printf("F");
    printf(".\n");

    return 0;
}

練習三：成年了嗎？
每個國家都會規定幾歲以上才是成年，那我們就來寫個程式來判斷年齡是否有成年吧。此練習題是18歲以上算成年喔！成年後就可以做好多事啊！

Exercise 3: Are you an adult?
In some countries, men and women come of age at 18. Now let's write a C program to determine is someone an adult. There are many things that adults can do.

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

int main()
{
    int age;
    printf("Enter your age:");
    scanf("%d", &age);

    if(age >= 18)
        printf("Congratulation!\n");
    else
        printf("There are %d years left to be an adult.\n", 18 - age);
    return 0;
}

練習四：奇數或偶數
設計一個可以判斷一個整數是奇數或是偶數的程式。

Exercise 4: Odd or even
Design a C program to determine whether an integer is odd or even. 

練習四參考解法：
Exercise 4 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    int number;
    printf("Please input an integer:");
    scanf("%d", &number);

    if( number % 2 )
        printf("%d is odd.\n", number);
    else
        printf("%d is even.\n", number);

    return 0;
}

練習五：可整除嗎？
寫一個可以判斷一個數是否可以同時被 3 與 11 整除。 

Exercise 5: Divisible 
Take an integer from user and determine whether it is divisible by 3 and 11.

練習五參考解法：
Exercise 5 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    int number;
    printf("Please input an integer:");
    scanf("%d", &number);

    if( number % 3 == 0 && number % 11 == 0 )
        printf("%d is divisible by 3 and 11.\n", number);
    else
        printf("%d isn't divisible by 3 and 11.\n", number);

    return 0;
}

練習六：最大值
輸入三個整數，程式輸出最大值。

Exercise 6: Maximum
Take three integers from user and print the maximum one.

練習六參考解法一：
Exercise 6 solution 1:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a, b, c;
    printf("Enter three integer:");
    scanf("%d%d%d", &a, &b, &c);

    printf("From %d, %d, %d, the maximum is ", a, b, c);

    if(a > b && a > c)
        printf("%d.\n", a);
    else if(b > c)
        printf("%d.\n", b);
    else
        printf("%d.\n", c);

    return 0;
}

練習六參考解法二：
Exercise 6 solution 2:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a, b, c;
    printf("Enter three integer:");
    scanf("%d%d%d", &a, &b, &c);

    int max;
    if(a > b)
        max = a;
    else
        max = b;

    if(max < c)
        max = c;

    printf("From %d, %d, %d, the maximum is %d.\n", a, b, c, max);

    return 0;
}

練習七：母音？子音？
設計一個程式可以判斷英文字母是母音或子音。

Exercise 7: Vowel or Consonant
Design a C program to print whether a letter alphabet is Vowel or Consonant. 

練習七參考解法：
Exercise 7 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    char letter;
    printf("Enter a letter:");
    scanf(" %c", &letter);

    if( letter == 'a' || letter == 'A' ||
        letter == 'e' || letter == 'E' ||
        letter == 'i' || letter == 'I' ||
        letter == 'o' || letter == 'O' ||
        letter == 'u' || letter == 'U' )
            printf("%c is Vowel.\n", letter);
    else
        printf("%c is Consonant.\n", letter);

    return 0;
}

練習八：月份英文名稱
設計一程式可讀取 [1 - 12] 的整數，輸出對應月份的英文名稱。

Exercise 8: Months Name
Write a C program that gets an integer [1 - 12] from user. And print the corresponding month name. 

練習八參考解法：
Exercise 8 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    int m;
    printf("Input an integer [1 - 12]:");
    scanf("%d", &m);

    if(m == 1)
    {
        printf("January\n");
    }
    else if(m == 2)
    {
        printf("February\n");
    }
    else if(m == 3)
    {
        printf("March\n");
    }
    else if(m == 4)
    {
        printf("April\n");
    }
    else if(m == 5)
    {
        printf("May\n");
    }
    else if(m == 6)
    {
        printf("June\n");
    }
    else if(m == 7)
    {
        printf("July\n");
    }
    else if(m == 8)
    {
        printf("August\n");
    }
    else if(m == 9)
    {
        printf("September\n");
    }
    else if(m == 10)
    {
        printf("October\n");
    }
    else if(m == 11)
    {
        printf("November\n");
    }
    else if(m == 12)
    {
        printf("Decemember\n");
    }
    else
    {
        printf("Invalid input.\n");
    }


    return 0;
}

練習九：第幾象限
設計一個可以判斷(x, y)座標在第幾象限的程式。

Exercise 9: Coordinate
Design a C program that print the quadrant of the given point(x, y).

練習九參考解法：
Exercise 9 solution:
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#include <stdio.h>
#include <stdlib.h>

int main()
{
    int x, y;
    printf("Enter the value of (X Y):");
    scanf("%d%d", &x, &y);

    if(x > 0 && y > 0)
    {
        printf("First");
    }
    else if(x < 0 && y > 0)
    {
        printf("Second");
    }
    else if(x < 0 && y < 0)
    {
        printf("Third");
    }
    else if(x > 0 && y < 0)
    {
        printf("Fourth");
    }

    printf(" Quadrant.\n");
    return 0;
}


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