プログラマ専用SNS ミクプラ

int strch_idx(const char* s,char c);

int main(){
	char s[50],c;

	cout << "文字列s：";
	cin >> s;

	strch_idx(s,c);

	cout << s[0];
}

int strch_idx(const char* s,char c){
		while(s)
			c = 1;
	return c;
}

#include <iostream>

using namespace std;

int strch_idx(const char *s,char c);

int main(void){
	char s[50],c;
	int n;
	
	cout << "文字列s:";
	cin >> s;
	cout << "文字c:";
	cin >> c;

	if((n = strch_idx(s,c)) == -1)
		cout << "エラー" << endl;
	else
		cout << "添字:" << n << endl;

	return 0;
}

int strch_idx(const char *s,char c){
	int count = 0;

	while(s[count] != '\0'){
		if(s[count] == c)
			return count;
		++count;
	}

	return -1;
}

int strch_idx(const char* s, char c)
{
  const char* ss = std::strchr(s, c);
  return ss != 0 ? ss - s : -1;
}

#include <stdio.h>

int		strch_idx( const char *str, char c )
{
	int	i;
	for( i=0; str>0; i++ )
	{
		if( str == c )
			return i;
	}

	return -1;
}

void	main()
{
	char	*s1 = "This is string1.";
	char	c = 's';
	char	c2= 'g';
	char	c3= 'z';

	printf( "%d\n", strch_idx( s1, c ) );
	printf( "%d\n", strch_idx( s1, c2) );
	printf( "%d\n", strch_idx( s1, c3) );

}

#include <stdio.h>

int strch_idx(const char *str, char c)
{
	for (int i = 0; str != '\0'; i++)
	{
		if (str == c) return i;
	}
	return -1;
}

int main()
{
	char *s1 = "テストThis is string1.";
	char c1 = 's';
	char c2 = 'g';
	char c3 = 'z';

	printf("%d\n", strch_idx(s1, c1));
	printf("%d\n", strch_idx(s1, c2));
	printf("%d\n", strch_idx(s1, c3));
}

#include <stdio.h>
#include <string.h>

void	main()
{
	char	*s = "テストthis is string.\n";

	printf( "searching 'z'...\n" );
	char	*p = strchr( s, 'z' );

	if( p == NULL )
		printf( "-1\n" );
	else
		printf( "%s\n", p );
}