/*
 *用str替换指定字符串从起始位置pos开始长度为len的字符 
 *string& replace (size_t pos, size_t len, const string& str); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 line = line.replace(line.find("@"), 1, ""); //从第一个@位置替换第一个@为空 
 cout << line << endl; 
 return 0; 
} 

/*
 *用str替换 迭代器起始位置 和 结束位置 的字符 
 *string& replace (const_iterator i1, const_iterator i2, const string& str); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 line = line.replace(line.begin(), line.begin()+6, ""); //用str替换从begin位置开始的6个字符 
 cout << line << endl; 
 return 0; 
} 

/*
 *用substr的指定子串（给定起始位置和长度）替换从指定位置上的字符串 
 *string& replace (size_t pos, size_t len, const string& str, size_t subpos, size_t sublen); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 string substr = "12345"; 
 line = line.replace(0, 5, substr, substr.find("1"), 3); //用substr的指定子串（从1位置数共3个字符）替换从0到5位置上的line 
 cout << line << endl; 
 return 0; 
} 

/*
 *用str替换从指定位置0开始长度为5的字符串 
 *string& replace(size_t pos, size_t len, const char* s); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 char* str = "12345"; 
 line = line.replace(0, 5, str); //用str替换从指定位置0开始长度为5的字符串 
 cout << line << endl; 
 return 0; 
} 

/*
 *用str替换从指定迭代器位置的字符串 
 *string& replace (const_iterator i1, const_iterator i2, const char* s); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 char* str = "12345"; 
 line = line.replace(line.begin(), line.begin()+9, str); //用str替换从指定迭代器位置的字符串 
 cout << line << endl; 
 return 0; 
} 

/*
 *用s的前n个字符替换从开始位置pos长度为len的字符串 
 *string& replace(size_t pos, size_t len, const char* s, size_t n); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 char* str = "12345"; 
 line = line.replace(0, 9, str, 4); //用str的前4个字符替换从0位置开始长度为9的字符串 
 cout << line << endl; 
 return 0; 
} 

/*
 *用s的前n个字符替换指定迭代器位置(从i1到i2)的字符串 
 *string& replace (const_iterator i1, const_iterator i2, const char* s, size_t n); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 char* str = "12345"; 
 line = line.replace(line.begin(), line.begin()+9, str, 4); //用str的前4个字符替换指定迭代器位置的字符串 
 cout << line << endl; 
 return 0; 
} 

/* 

*用重复n次的c字符替换从指定位置pos长度为len的内容 
 *string& replace (size_t pos, size_t len, size_t n, char c); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 char c = '1'; 
 line = line.replace(0, 9, 3, c); //用重复3次的c字符替换从指定位置0长度为9的内容 
 cout << line << endl; 
 return 0; 
} 

/*
 *用重复n次的c字符替换从指定迭代器位置（从i1开始到结束）的内容 
 *string& replace (const_iterator i1, const_iterator i2, size_t n, char c); 
 */ 
int main() 
{ 
 string line = "this@ is@ a test string!"; 
 char c = '1'; 
 line = line.replace(line.begin(), line.begin()+9, 3, c); //用重复3次的c字符替换从指定迭代器位置的内容 
 cout << line << endl; 
 return 0; 
}