如何比较字符串与浮点数？在目标C中

Question

你好吗？我有问题.谢谢.

我正在使用

if (myString == myfloat) {
// do something but this won't work
}

要么

if ([myString == myFloat]) {
// do something but this won't work
}

谢谢!

Answer 1

该==操作不仅使当两个类型是兼容的,这是不是字符串和浮点数的情况下感.一方必须明确转换为另一方.

您可以将NSString转换为float:

if ([myString floatValue] == myFloat) {
  // Note: Use "fabs(a - b) < epsilon" to avoid inequality due to precision lost.

或者将float转换为NSString(非常不寻常):

if ([myString isEqualToString:[NSString stringWithFormat:@"%g", myFloat]]) {
  // Note: make sure the string is encoded as "%g" as well.