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C++ function

I need a function that takes a reference to a string object and that converts the contents of the string to uppercase.

string function(string s) {
	for (int i = 0; i < strlen(s); i++)
		s=toupper(s);
	return s;
}

When I compile, I get the error: Cannot convert 'string' to 'const char *'. Please help.

(edited 11 years ago)

Reply 1

Jiggle

Hello Thomas.

strlen takes a C-style string as an argument, not a std::string, therefore you must use s.c_str() as the argument when calling strlen.

Here is the function prototype


size_t strlen ( const char * str );

Reply 2

GoodbyeTSR

Original post by Jiggle

Hello Thomas.

strlen takes a C-style string as an argument, not a std::string, therefore you must use s.c_str() as the argument when calling strlen.

Here is the function prototype


size_t strlen ( const char * str );

I can use s.size() either, right?

Reply 3

Jiggle

Yes, s.size() would work fine also.

Reply 4

maturestudy


string::iterator it;
for ( it=str.begin() ; it < str.end(); it++ )
     *it = toupper(*it);

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