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	the first attempt:
	typedef struct Pet{
    	char* name;
        int legs;
    	char* color;
    } pet;
void writedata(pet *Pet, size_t FIELD){
	char *base;
	char* b;
	base=(char*) Pet;
	char string[50];
	offset=offsetof(Pet, FIELD);
	b=(char *)(base+offset);
	gets(string);
 
	*b/*(char*)Pet+offsetof(Pet, FIELD)*/ = (char*)malloc(strlen(string)+1);
	strcpy(*b, string);
}
void addpet(pet* Pet, int &TotalLegs){
	puts("Input name\n");
	writedata(Pet, offsetof(Pet, name));//how I actually wanted it to work
	writedata(Pet, offsetof(Pet, color));
___________________________________________________
 
	the second attempt:
	typedef struct Pet{
        char* name;
        int legs;
        char* color;
    } pet;
    void writedata(pet *Pet, size_t FIELD){
        char string[50];
        gets(string);
        (char*)Pet+offsetof(struct Pet, FIELD) = (char*)malloc(strlen(string)+1);
        strcpy((char*)Pet+FIELD, string);
    }
 

prog.c:1:2: error: unknown type name ‘the’
  the first attempt:
  ^
prog.c:1:12: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘attempt’
  the first attempt:
            ^
prog.c:6:7: warning: data definition has no type or storage class [enabled by default]
     } pet;
       ^
prog.c:6:7: warning: type defaults to ‘int’ in declaration of ‘pet’ [-Wimplicit-int]
prog.c:7:16: error: expected declaration specifiers or ‘...’ before ‘pet’
 void writedata(pet *Pet, size_t FIELD){
                ^
prog.c:7:26: error: unknown type name ‘size_t’
 void writedata(pet *Pet, size_t FIELD){
                          ^
prog.c:19:13: error: expected declaration specifiers or ‘...’ before ‘pet’
 void addpet(pet* Pet, int &TotalLegs){
             ^
prog.c:19:27: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void addpet(pet* Pet, int &TotalLegs){
                           ^

Standard output is empty