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#include <bits/stdc++.h>using namespace std;int main(){ // 字符转大小写 cout << (char)toupper('a') << endl; cout << (char)toupper('A') << endl; cout << (char)tolower('a') << endl; cout << (char)tolower('A') << endl; puts("×××××××××××××××××××完××××美××××分××××割××××线×××××××××××××××××××"); //char 转 int,long int,long long int,double //方法一：atoi atol atoll atof char s1[]="12345654"; char s2[]="123.23"; int n1 = atoi(s1); long int n2 = atol(s1); long long int n3 = atoll(s1); double n4 = atof(s2); cout << n1 << ' ' << n2 << ' ' << n3 << ' ' << n4 << endl; //方法二：sscanf int a1; sscanf(s1,"%d",&a1); cout << a1 << endl; double a2; sscanf(s2,"%lf",&a2); cout << a2 << endl; char s3[]="AF"; int a3; sscanf(s3,"%X",&a3); //16进制转换成10进制 cout << a3 << endl; puts("×××××××××××××××××××完××××美××××分××××割××××线×××××××××××××××××××"); //cstring 与 string 的转换 string s4 = "This is a test"; char s5[20]; s5.format("%s", s4.c_str()); cout << s5 << endl;} |