C语言设计一个函数实现加减乘除运算

C语言设计一个函数实现加减乘除运算

# include

double jia(double x, double d)

{

double s;

s = x+d;

return s;

}

double jian(double x, double d)

{

double s;

s = x-d;

return s;

}

double cheng(double x, double d)

{

double s;

s = x*d;

return s;

}

double chu(double x, double d)

{

double s;

s = x/d;

return s;

}

int main(void)

{

double i, j, k;

char t;

k = 0;

printf（＂请输入要计算什么运算“+”“-”“*”“/”n＂）;

scanf(＂%c＂, &t);

if(t == '+')

{

printf（＂请输入要相加的两个数n＂）;

scanf(＂%lf %lf＂, &i, &j);

k = jia(i, j);

printf（＂这两个数相加为%6.2lfn＂, k）;

}

else if(t == '-')

{

printf（＂请输入要相减的两个数n＂）;

scanf(＂%lf %lf＂, &i, &j);

k = jian(i, j);

printf（＂这两个数相减为%6.2lfn＂, k）;

}

else if(t == '*')

{

printf（＂请输入要相*的两个数n＂）;

scanf(＂%lf %lf＂, &i, &j);

k = cheng(i, j);

printf（＂这两个数相*为%6.2lfn＂, k）;

}

else if(t == '/')

{

printf（＂请输入要相/的两个数n＂）;

scanf(＂%lf %lf＂, &i, &j);

k = chu(i, j);

printf（＂这两个数相/为%6.2lfn＂, k）;

}

else

{

printf（＂对不起目前只支持“+”“-”“*”“/”n＂）;

}

return 0;

}

如何编写一个C语言程序让计算机自动出四则运算计算

#include

#include

#include

#include

int main()

{

int type;

int left, right;

float result;

srand(unsigned(time(NULL)));

while(1)

{

type = rand() % 4;

left = rand() % 10;

right = rand() % 10;

switch(type)

{

case 0:

printf(＂%d + %d = ?n＂, left, right);

scanf(＂%f＂, &result);

if(left + right == result)

printf(＂right!n＂);

else

printf(＂wrong!The result is %dn＂, left + right);

break;

case 1:

printf(＂%d - %d = ?n＂, left, right);

scanf(＂%f＂, &result);

if(left - right == result)

printf(＂right!n＂);

else

printf(＂wrong!The result is %dn＂, left - right);

break;

case 2:

printf(＂%d * %d = ?n＂, left, right);

scanf(＂%f＂, &result);

if(left * right == result)

printf(＂right!n＂);

运用java的基本库类实现一个计算四则运算的程序

package Ex1; //Ex1为包名

import java.util.*;

public class SzYs { //SzYs为类名

public static void main(String[] args){

double num1;

double num2;

String fuHao;

Scanner input = new Scanner(System.in);

System.out.print（＂输入第一个数的值：＂）；

num1 = input.nextDouble();

System.out.print（＂输入第二个数的值：＂）；

num2 = input.nextDouble();

System.out.print（＂输入运算符号（+ - * \ ）＂）；

fuHao = input.next();

if(fuHao.equals(＂+＂)){

System.out.print(num1 + ＂与＂ + num2 + ＂的和是＂ + （num1+num2）);

}else if(fuHao.equals(＂-＂)){

System.out.print(num1 + ＂与＂ + num2 + ＂的差是＂ + （num1-num2）);

}else if(fuHao.equals(＂8＂)){

System.out.print(num1 + ＂与＂ + num2 + ＂的积是＂ + （num1*num2）);

}else if(fuHao.equals(＂\＂)){

if(num2==0){

System.out.print（＂除数不能为0＂）;

}else{

System.out.print(num1 + ＂与＂ + num2 + ＂的商是＂ + （num1/num2）);

}

}else{

System.out.print（＂不能辨认该符号＂）；

}

}

}

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