Question

char p[20]={'a','b','c','d'},q[]="abc",r[]="abcde"; strcat(p,r);strcpy(p+st

char p[20]={'a','b','c','d'},q[]="abc",r[]="abcde";
strcat(p,r);strcpy(p+strlen(q),q);
printf("%d\n",strlen(p));
怎么运行，结果为什么是6

Answer 1

strcat(p,r);后
p="abcdabcde"

strcpy(p+strlen(q),q);后p的第7位是'\0'
p="abcabc"
当然是6