Question

【急】编写C函数 就是C函数库里函数的功能.

Answer 1

char* StrCat (char *firstStr, char *secondStr)

{

char* beg = firstStr;

while(*firstStr) ++firstStr;

while(*firstStr++=*secondStr++);

return beg;

}

char* StrCpy (char *firstStr, char *secondStr)

{

char* beg = firstStr;

while(*firstStr++=*secondStr++);

return beg;

}