C语言-strcpy

C语言-strcpy

    char a[10] = "abcde";
	char b[5] = "XYZ";
	strcpy(a,b);
	printf("%c",a[2]);

执行strcpy后，a的前4个元素被复制为b的元素，剩余部分保持不变

strcpy(a,b);

把b的值复制到a, b的元素个数小于a，则复制b的元素到a中，包括 \0 ,

    char a[10] = "abcde";
	char b[5] = "XYZ";

定义之后

元素	值
a[0]	‘a’
a[1]	‘b’
a[2]	‘c’
a[3]	‘d’
a[4]	‘e’
a[5]	‘\0’
b[0]	‘X’
b[1]	‘Y’
b[2]	‘Z’
b[3]	‘\0’

strcpy(a,b);

复制后

元素	值
a[0]	‘X’
a[1]	‘Y’
a[2]	‘Z’
a[3]	‘\0’
a[4]	‘e’
a[5]	‘\0’
b[0]	‘X’
b[1]	‘Y’
b[2]	‘Z’
b[3]	‘\0’