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