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Closed 11 years ago.
one of the required work is to implement the "sin" button on the calculator Add the following 4 operation buttons: • sin : calculates the sine of the top operand on the stack.
这是我的代码
- (double)performOperation:(NSString *)operation
{
double result = 0;
if ([operation isEqualToString:@"+"]) {
result = [self popOperand] + [self popOperand];
}else if ([@"*" isEqualToString:operation]) {
result = [self popOperand] * [self popOperand];
}else if ([operation isEqualToString:@"-"]) {
double subtrahend = [self popOperand];
result = [self popOperand] - subtrahend;
}else if ([operation isEqualToString:@"/"]) {
double divisor = [self popOperand];
if(divisor) result = [self popOperand] / divisor;
}else if([operation isEqualToString:@"sin"]){
double operd = [self popOperand];
NSLog(@"operd=%g",operd);
if(operd) result = sin(operd);
}
[self pushOperand:result];
return result;
}
我尝试输入罪( 60) 和结果=-0. 304811
但我实际上在窗口中使用计算器 结果为0.8860254
我不知道我的代码有什么问题