有条件运算符中的此分配有什么问题？ [英] What is wrong with this assignment in a conditional operator?

问题描述

有错误。
在以下代码中为a [i]分配值是否错误？
或条件运算符有问题吗？

There is an error. Is it wrong to assign a value to a[i] in the following code? Or something is wrong with conditional operators?

#include<stdio.h>
#include<string.h>
int main(){
  char a[12]="sumit tyagi";
  int i=0;
  while(a[i]!='\0'){ 
  a[i]>90 ? a[i]=a[i]-32 : a[i]=a[i]+32; //error in this line
  i++;
  } 
  printf("\n %s",a);

推荐答案

a [i]> 90？ a [i] = a [i] -32：a [i] = a [i] +32;

是不是评估为

a [i]> 90吗？ （a [i] = a [i] -32）：（a [i] = a [i] +32）;

因为 = 的优先级低于？：。在标准C语言中，尽管某些编译器允许将其作为扩展，但是您无法如上所述编写。

since = has lower precedence than ?:. In standard C you can't write it as above although some compilers allow it as an extension.

您可以将其编写为更具可读性（和可移植性）

You could write it as the more readable (and portable)

a[i] += a[i] > 90 ? -32 : +32;

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