#include <stdio.h>

#include <string.h>

int main(){

    const char * cs="Hello World";

    const char * ct="Hello";

    char * s=malloc();

    memset(s,,);

    char * t;

    int c='o';

    const size_t n=;

    //strcpy(s,ct);

    printf("const char * cs=Hello World;\n\

    const char * ct=Hello;\n\

    int c=o;\n\

    const size_t n=;\n\

    ");

    printf("=============================================\n");

    printf("\tthe result of strcpy(s,ct) is: %s\n",strcpy(s,ct));

    t=strncpy(s,ct,n);

    *(t+n)='\0';

    printf("\tthe result of char * strncpy(s,ct,n) is: %s\n",t);

    memcpy(s,ct,strlen(ct));//copy ct to s

    printf("\tthe result of char * strcat(s,ct) is: %s\n",strcat(s,ct));

    printf("\tthe result of char * strchr(cs,c) is: %s\n",strchr(cs,c));

    printf("\tthe result of char * strrchr(cs,c) is: %s\n",strrchr(cs,c));

    printf("\tthe result of size_t strspn(cs,ct) is: %d\n",strspn(cs,ct));

    printf("\tthe result of char * strpbrk(cs,ct) is: %s\n",strpbrk(cs,ct));

    printf("\tthe result of size_t strlen(cs) is: %d\n",strlen(cs));

}