Common string operations in C

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        Int main (void) {char str1 [] = "This is the first string"; char str2 [] = "That is the other string"; // printf (strcpy (str1, str2); // copy string // printf (strncpy (str1, str2, 20); // copy string specified length content // printf ("% d ", strlen (str1); // String Length // printf (strcat (str1, str2); // link string // printf (strncat (str1, str2, 20 )); // specify the length of the link. // printf ("% d", strcmp (str1, str2 )); // compare the string size /// printf ("% d", strncmp (str1, str2, 5); // compare the string size with the specified length // char * pGot_char = Strchr (str1, 'I'); // returns the address of the character to be searched. // printf ("% c", * pGot_char ); // print the content of the address // if (strstr (str1, "the") = NULL) {// search for substrings // printf ("no found "); //} // else {// printf ("has found"); //} // char buf [40]; // gets (buf ); // read the input string into the array, which can contain spaces in the middle until the carriage return, different from scanf // printf ("% s", buf); // compared with gets, fgets can specify the maximum length of the input string // In addition, gets can only be used for the standard input stream stdin, and fgets can be used for any type of input string // when entering line breaks, fgets stores a '\ n' character, but gets does not. // Fgets (buf, sizeof (buf), stdin); // printf ("% s", buf); // convert the atof string to double, atoi string to int // atol string to long, atoll string to longlong // char value_str [] = "99.4"; // double value = atof (value_str ); // printf ("% f", value); // wide string // wchar_t proverb1 [] = L "This is a wide type string "; // wchar_t proverb2 [] = L "This is an other wide string"; // wchar_t wchar = L 'W'; // wchar_t wsring [] = L "wide "; // printf ("% S \ n", proverb1); // The print must use % S instead of % s. //// printf ("% d \ n", wcslen (proverb1); // width String Length, do not include the terminator '\ 0' // wcscpy (proverb1, proverb2); // copy the wide string // wcsncpy (proverb1, proverb2, 15 ); // copy the specified length // wcscat (proverb1, proverb2); // connection width string // wcscmp (proverb1, proverb2); // compare the size // wcsncmp (proverb1, proverb2, 15); // compare the width of a string of the specified length // wcschr (proverb1, wchar); // search for the width of the string // wcsstr (proverb1, wsring ); // search for the wide string wchar_t ina [80] = L "ss"; fgetws (ina, sizeof (ina), stdin); // obtain the input wide string, specifies the maximum length, and the standard input stream printf ("% S", ina); return 0 ;}