既然選擇了遠方便只顧風雨兼程

阿新 • • 發佈：2019-01-11

strchr

const char *strchr (const char *str, int character);
      char *strchr (      char *str, int character);

1. Locate first occurrence of character in string
Returns a pointer to the first occurrence of character in the C string str.
The terminating null-character is considered part of the C string. Therefore, it can also be located in order to retrieve a pointer to the end of a string.
1.1 Parameters

str
C string.
character
Character to be located. It is passed as its int promotion, but it is internally converted back to char for the comparison.
1.2 Return Value
A pointer to the first occurrence of character in str.
If the character is not found, the function returns a null pointer.
1.3 Portability

In C, this function is only declared as:

char * strchr ( const char *, int );

instead of the two overloaded versions provided in C++.
2. Example
2.1 example

/*
 ============================================================================
 Name        : strchr_example_1.c
 Author      : foreverstrong
 Version     :
 Copyright   : Your copyright notice
 Description : Hello World in C, Ansi-style
 ============================================================================
 */

/* strchr example */
#include <stdio.h>
#include <string.h>

int main()
{
	char str[] = "This is a sample string";
	char *pch;
	printf("Looking for the 's' character in \"%s\"...\n", str);
	pch = strchr(str, 's');
	while (pch != NULL)
	{
		printf("found at %d\n", pch - str + 1);
		pch = strchr(pch + 1, 's');
	}
	return 0;
}

Output:

Looking for the 's' character in "This is a sample string"...
found at 4
found at 7
found at 11
found at 18

3. strchr
Defined in header <string.h>

char *strchr(const char *str, int ch);

Finds the first occurrence of ch (after conversion to char as if by (char)ch) in the null-terminated byte string pointed to by str (each character interpreted as unsigned char). The terminating null character is considered to be a part of the string and can be found when searching for '\0'.
The behavior is undefined if str is not a pointer to a null-terminated byte string.
3.1 Parameters
str - pointer to the null-terminated byte string to be analyzed
ch - character to search for
3.2 Return value
Pointer to the found character in str, or null pointer if no such character is found.
4. Example
4.1 example

/*
 ============================================================================
 Name        : strchr_example_2.c
 Author      : foreverstrong
 Version     :
 Copyright   : Your copyright notice
 Description : Hello World in C, Ansi-style
 ============================================================================
 */

/* strchr example */
#include <stdio.h>
#include <string.h>

int main(void)
{
	const char *str = "Try not. Do, or do not. There is no try.";
	char target = 'T';
	const char *result = str;

	while ((result = strchr(result, target)) != NULL)
	{
		printf("Found '%c' starting at '%s'\n", target, result);
		++result;
		// Increment result, otherwise we'll find target at the same location
	}
}

Output:

Found 'T' starting at 'Try not. Do, or do not. There is no try.'
Found 'T' starting at 'There is no try.'

既然選擇了遠方便只顧風雨兼程

strchr

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既然選擇了遠方 便只顧風雨兼程

strchr

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