strcmp ，strcat，strspy 函数的实现

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strcmp 函数的实现

#include <stdio.h>

char *mystrcpy(char *q, char *p)
{
char *temp = q;

while(*p != '\0')
{
*q++ = *p++;
}
*q = '\0';

return temp;
}

int main(void)
{
char dest[64], src[64] = {};

scanf("%s", src);

printf("%s\n", mystrcpy(dest, src));

return 0;

}

strcat函数的实现

#include <stdio.h>

char *mystrcat(char *p1, char *p2)
{
char *temp = p1;

while(*p1++ != '\0')
{
}

p1--;
while(*p2 != '\0')
{
*p1++ = *p2++;
}
*p1 = '\0';

return temp;
}

int main(void)
{
char s1[64], s2[64];

scanf("%s%s", s1, s2);

printf("%s\n", mystrcat(s1, s2));

return 0;
}

strcmp 函数的实现

#include <stdio.h>

int mystrcmp(char *p1, char *p2)
{
while(*p1==*p2 && *p1!='\0')
{
p1++;
p2++;
}

if(*p1 == *p2)
{
return 0;
}
else
{
if(*p1 > *p2)
{
return 1;
}
else
{
return -1;
}
}
}

int main(void)
{
char s1[64], s2[64];

scanf("%s%s", s1, s2);

printf("%d\n", mystrcmp(s1, s2));

return 0;
}