ios-無法實現計算，打印到label上

無法實現計算，打印到label上

應用中點擊計算按鈕時的代碼：

 float sqft = ([textfield1.text floatValue]);
float thick= ([textfield2.text floatValue]);
float cos = ([textfield3.text floatValue]);
float eff = ([textfield4.text floatValue]);

float num = ((thick*.5)*sqft)/eff;
float cost = (num*cos);
float costft = (cost/sqft);

label1.text = [NSString stringWithFormat:@"%2.f",num];
label2.text = [NSString stringWithFormat:@"%2.f",cost];
label3.text = [NSString stringWithFormat:@"%2.f",costft];

但是label只返回0？我設置了標簽為字符串。但是結果是一樣的。

最佳回答：

問題是%2.f。

%2.f返回的答案是2 數字的格式，如果結果小於或等於0.5。那麼答案就會得0

float sqft = ([textfield1.text floatValue]);
float thick= ([textfield2.text floatValue]);
float cos = ([textfield3.text floatValue]);
float eff = ([textfield4.text floatValue]);

float num = ((thick*.5)*sqft)/eff;
float cost = (num*cos);
float costft = (cost/sqft);

label1.text = [NSString stringWithFormat:@"%2f",num];
label2.text = [NSString stringWithFormat:@"%2f",cost];
label3.text = [NSString stringWithFormat:@"%2f",costft];