C語言學習

 int main(){int i;char * msg= (char *)malloc(6);char buff[] ="2mxbcd";char thechar[20];char otherchar[] ="123456";msg =buff;printf("array -1 %d",otherchar[-1]);//printf("size of unsigned short is %d, char is %d",sizeof(unsigned short), sizeof(char));printf("msg is %d,%d,%d,%d,%d,%d",msg[0],msg[1],msg[2],msg[3],msg[4],msg[5]);printf("msg is %d,msg +1 is %d, value: %d",msg,msg+1,*(msg+1));unsigned short test1 =(*((unsigned short*)(msg+1)));printf("test1 is %d",test1);memcpy(msg,msg+1,5);printf("msg is %c,%c,%c,%c,%c,%c",msg[0],msg[1],msg[2],msg[3],msg[4],msg[5]);memcpy(thechar,otherchar,6);printf("thechar is %c,%c,%c,%c,%c,%c,%cn",thechar[0],thechar[1],thechar[2],thechar[3],thechar[4],thechar[5],thechar[6]);for(i=6;i > 0;i--){    thechar[i] =thechar[i-1];}printf("thechar is %c,%c,%c,%c,%c,%c,%cn",thechar[0],thechar[1],thechar[2],thechar[3],thechar[4],thechar[5],thechar[6]);for(i=7;i > 0;i--){    printf("%dn",i);}return 0;}