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求串的长度算法的实现

#include<stdio.h>
#define MAX 12500
int slength(char ch[]) 
{ 
   int i=0; 
   while (ch[i]!='\0') i++; 
   return i; 
}
void main()
{
	int m;
	char ch[MAX];
	printf("input the string:");
	scanf("%s",ch);
	m=slength(ch);
	printf("the length of the string is %d",m);
}