为什么运行不了QAQ

#include <stdio.h>

double n;

double sum;

double num;

double f(double n,double num)

{

if(n<=3.0,5<=num<23)

{

sum=13;

}

else if(n<=3.0,0<=num<5||23<=num<24)

{

sum=13+2*3;

}

else if(n>3.0,0<=num<5||23<=num<24)

{

sum=13+2*n+(n-3)*2.3;

}

else(n>3.0,5<=num<23);

{

sum=13+(n-3)*2.3;

}

return sum;

}

int main()

{

double a;

double b;

double x;

f(12,9)=a;

f(12,6)=b;

x=a+b+1,

printf ("%f",x);

return 0;

}

慕妹6462540

2021-09-30

源自：C语言入门 5-14

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2 回答

慕UI6243011
2021-10-02

if(n<=3.0,5<=num<23)

{

sum=13;

}

else if(n<=3.0,0<=num<5||23<=num<24)

{

sum=13+2*3;

}

else if(n>3.0,0<=num<5||23<=num<24)

{

sum=13+2*n+(n-3)*2.3;

}

else(n>3.0,5<=num<23);

{

sum=13+(n-3)*2.3;

}

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0 回复有任何疑惑可以回复我~

慕少2300120
2021-10-01

c:在函数“main”中：

hello.c:65:12:错误：赋值的左操作数需要左值

f（12,9）=a；

^

hello.c:67:12:错误：赋值的左操作数需要左值

f（12,6）=b；

^

你好。c:在顶层：

hello.c:78:5:错误：应为标识符或“return”之前的“（”

返回0；

^~~~~~

hello.c:79:1:错误：应为标识符或“（”在“}”之前）标记

}

0 回复有任何疑惑可以回复我~

#1

慕妹6462540 提问者

就是不知道怎么赋左值QAQ函数不就是一个值吗？

2021-10-02 回复有任何疑惑可以回复我~

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