Dart：打印整数和字符串

Question

考虑以下代码。

void main() {
  int num = 5;
  print('The number is ' + num);
}

当我尝试打印变量 num 的值时，出现异常：The argument type 'int' can't be assigned to the parameter type 'String'.

我该如何打印数字？

Answer 1

只需将 toString() 添加到您的整数。类似于JS。

void main() {
  int num = 5;
  print('The number is ' + num.toString()); // The number is 5
}

Answer 2

为了打印 int 的值以及您需要使用字符串插值的字符串：

void main() {
  int num = 5;
  print("The number is $num");
}

Answer 3

void main() {
int age = 10;
double location = 21.424567;
bool gender = true;
String name = "The EasyLearn Academy";

print(age); 
print(location);
print(gender); 
print(name); 

print("age $age"); 
print("location $location");
print("gender $gender"); 
print("name $name}"); 

print("age " + age.toString()); 
print("location " + location.toString());
print("gender " + gender.toString()); 
print("name " + name);

}

Dart：打印整数和字符串

Dart : Printing integer along with string

concatenation

string-concatenation

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