I try to make a test code to get the pointer return value:
#include <stdio.h> int main(void){ char myStrcpy(char *str1,char *str2){ while(*str2 != '\0'){ *str1++ = *str2++; } *str1 = '\0'; return str1;// return the final pointer that should point to the '\0' } char *reValue; char string1[] = "abcd"; char string2[10]; reValue = myStrcpy(string2,string1); reValue--;//now it should point to the last character which is `d` printf("this value of string 2 is %s\n",string2); printf("the return value the function is %c\n",*reValue); return 0; } gcc compiles this code with no error and warning, but clang gives me 4 errors:
my_stcpy.c:4:40: error: expected ';' at end of declaration char* myStrcpy(char *str1,char *str2){ ^ ; my_stcpy.c:14:2: error: use of undeclared identifier 'reValue' reValue = myStrcpy(string2,string1); ^ my_stcpy.c:15:2: error: use of undeclared identifier 'reValue' reValue--; ^ my_stcpy.c:17:50: error: use of undeclared identifier 'reValue' printf("the return value the function is %c\n",*reValue); ^ 4 errors generated. any idea?
