6.1找出两个字符串第一个相同的字符

#include <stdio.h> char *find_char( char const *source, char const *chars ); void main() { char source[20],chars[20]; char *p; gets(source); gets(chars); p = find_char(source, chars); if ( p != NULL ) printf("%c/n",*p); else printf("don't find/n"); } char *find_char( char const *source, char const *chars ) { int i; char *p; for (i=0; *(source+i)!='/0'&&*(chars+i)!='/0'; i++) if ( *(source+i)==*(chars+i) ) { p = source+i; break; } if ( *(source+i)=='/0' || *(chars+i)=='/0' ) p = NULL; return(p); }