C String: String Search (Simple Note)

Simple Note

Code

#include <stdio.h>
#include <string.h>
/**
 * 
 * Tested with Dev-C++ 4.9.9.2
 *  
 * Practice of string compare.
 *
 * char * strstr ( const char *, const char * ); 
 *            Locate substring
 *            Returns a pointer to the first occurrence of str2 in str1,
 *            or a null pointer if str2 is not part of str1.
 *
 * References: 
 *        http://www.cplusplus.com/reference/cstring/strstr/
 * 
 */

int main () {
    // string
    char* chPtr = "abcdwxyz";
    char* pos;

    /** Search a string within chPtr
     *
     */
    // memory address
    pos = strstr(chPtr, "cd");
    printf("Is 'cd' in chPtr? \n%s\n", (pos != NULL? "true" : "false"));
    // start index is pos - chPtr
    if (pos != NULL) {
        printf("What is the first start index (start from 0) of 'cd' in chPtr? \n%d\n\n", (pos - chPtr));
    }

    printf("abcd starts from \n%d\n", strstr(chPtr, "abcd") - chPtr);
    printf("abcd starts from \n%d\n\n", strstr(chPtr, "wxyz") - chPtr);

    system("PAUSE");
    return 0;
}

Result

References

strstr
http://www.cplusplus.com/reference/cstring/strstr/

Download

Source code at github
https://github.com/benbai123/C_Cplusplus_Practice/blob/master/C_StringProcessing/string_search.c