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Copies ch into the first count characters of buf

//Declaration: void *memset(void *buf, int ch, size_t count); //Return: returns buf. #include <string.h> #include <stdio.h> int main(void){ char buf[100]; memset(buf, '\0', 100); memset(buf, 'j', 10); printf(buf); } /* jjjjjjjjjj */