the third day on the National Day

strcpy

int main(int argc, const char *argv[])
{
	char str1[32] = "hello";
	char str2[32] = "world";
	int i;
	for(i=0;i

strlen

int main(int argc, const char *argv[])
{
	char str[] = "mystrlen";
	int i;
	int count=0;
	for(int i=0;i

strcmp

int main(int argc, const char *argv[])
{
	char str1[] = "hello";
	char str2[] = "world";
	int i=0;
	while(str1[i]==str2[i])
	{
		if(0==str1[i])
		{
			break;
		}
		i++;
	}
	if(str1[1]-str2[i]>0)
	{
		printf("str1>str2\n");
	}
	else if(str1[i]-str2[i]<0)
	{
		printf("str1

strcat

int main(int argc, const char *argv[])
{
	char str1[] = "hello";
	char str2[] = "world";
	int i;
	for(i=0;str1[i]!=0;i++);
	int j;
	for(j=0;str2[j]!=0;j++)
	{
		str1[i++] = str2[j];
	}
	str1[i] = str2[j];
	puts(str1);

	return 0;
}