8-6.cpp

能判断二次函数是否有根

/*3208006411*/
#include<stdio.h>
void main()
{void concatenate(char string1[],char string2[],char string[]);
char s1[100],s2[100],s[100];
printf("\ninput string1:");
scanf("%s",s1);
printf("input string2:");
scanf("%s",s2);
concatenate(s1,s2,s);
printf("The new string is %s\n",s);
}
void concatenate(char string1[],char string2[],char string[])
{int i,j;
for(i=0;string1[i]!='\0';i++)
string[i]=string1[i];
for(j=0;string2[j]!='\0';j++)
string[i+j]=string2[j];
string[i+j]='\0';
}