1. double, float 类型小数点后取两位输出
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printf("%0.2f\n", number);
cout << fixed << setprecision(2) << number << endl; |
2. 无视空格输入一整行
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string str;getline(cin, str);char
str[100];
gets(str);
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3. 整数转化为字符串
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char
str[100];
int n = 1000;
sprintf(str, "%d", n);
#include <sstream>string result;int n = 10000;
stream << n;stream >> result; |
4. string 到 int 的转换
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#include <sstream>string result = "100000";
int n = 0;
stream << result;stream >> n; |