前言

????????C語言是大多數小白走上程序員道路的第一步，在了解基礎語法后，你就可以來嘗試解決以下的題目。放心，本系列的文章都對新手非常友好。

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Tips：題目是英文的，但我相信你肯定能看懂

一、四則運算 題目

(Math tutor) Write a program that displays a menu as shown in the sample run. You can enter 1, 2, 3, or 4 for choosing an addition, subtraction, multiplication, or division test. After a test is finished, the menu is redisplayed. You may choose another test or enter 5 to exit the system. Each test generates two random single-digit numbers to form a question for addition, subtraction, multiplication, or division. For a subtraction such as number1 – number2, number1 is greater than or equal to number2.? For a division question such as number1 / number2, number2 is not zero.

<Output>

Main menu

1: Addition

2: Subtraction

3: Multiplication

4: Division

5: Exit

Enter a choice: 1<enter icon>

What is 1 + 7? 8<enter icon>

Correct

Main menu

1: Addition

2: Subtraction

3: Multiplication

4: Division

5: Exit

Enter a choice: 1<enter icon>

What is 4 + 0? 5<enter icon>

Your answer is wrong. The correct answer is 4

Main menu

1: Addition

2: Subtraction

3: Multiplication

4: Division

5: Exit

Enter a choice: 4<enter icon>

What is 4 / 5? 1<enter icon>

Your answer is wrong. The correct answer is 0

Main menu

1: Addition

2: Subtraction

3: Multiplication

4: Division

5: Exit

Enter a choice:

<End Output>

二、代碼示例

#include <stdio.h> #include <stdlib.h> #include <time.h>int ranNum (void); void printIn (int);int main() {int a,n1,n2,c;while(a!=5){n1=ranNum ();n2=ranNum ();printf("Main menu\n1: Addition\n2: Subtraction\n3: Multiplication\n4: Division\n5: Exit\nEnter a choice: ");scanf("%d",&a);if (a==1){printf("What is %d + %d?",n1,n2);c=n1+n2;printIn (c);}if (a==2){printf("What is %d - %d?",n1,n2);while (n1<n2){n1=ranNum ();}c=n1-n2;printIn(c);}if (a==3){printf("What is %d * %d?",n1,n2);c=n1*n2;printIn(c);}if (a==4){printf("What is %d / %d?",n1,n2);while (n2==0){n2=ranNum ();}c=n1/n2;printIn(c);}}return 0; }int ranNum (){int n;srand (time(NULL)+rand());n=rand()%10;return (n);}void printIn(int c){int b;scanf("%d",&b);if (b==c)printf("Correct\n\n");elseprintf("Your answer is wrong. The correct answer is %d\n\n",c);}

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總結

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總結

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