#include <stdio.h>
#include <math.h>
typedef struct circle
{
double x;
double y;
double r;
} CIR;
CIR scan_circle (void);
void print_circle(CIR c);
int relationship (CIR c1,CIR c2);
int main ()
{
CIR c1,c2;
c1=scan_circle();
c2=scan_circle();
print_circle(c1);
print_circle(c2);
printf("%d\n",ship(c1,c2));
}
CIR scan_circle (void)
{
CIR c;
printf("请输入圆心横坐标，x=");
scanf("%lf",&c.x);
printf("请输入圆心纵坐标，y=");
scanf("%lf",&c.y);
printf("请输入圆半径，r=");
scanf("%lf",&c.r);
}
void print_circle (CIR c)
{
printf("(x,y)=(%.2f, %.2f), r=%.2f\n",c.x,c.y,c.r);
}
int relationship (CIR c1,CIR c2)
{
double l;
l=abs((c1.x-c2.x)*(c1.x-c2.x)+(c1.y-c2.y)*(c1.y-c2.y));
if (l==c1.r+c2.r||l==sqrt(c1.r-c2.r))
return 0; //printf("相切\n");
else if (abs(c1.r-c2.r)<l&&l<c1.r+c2.r)
return -1; // printf("相交\n");
else return 1 ; //printf("相离\n");
}
输出圆的那个函数！！
拜托了！

#include <stdio.h>
#include <math.h>
typedef struct circle
{
double x;
double y;
double r;
} CIR;
CIR scan_circle(void);
void print_circle(CIR c);
void relationship(CIR c1, CIR c2);
int main()
{
CIR c1, c2;
c1 = scan_circle();
c2 = scan_circle();
print_circle(c1);
print_circle(c2);
relationship(c1, c2);
}
CIR scan_circle(void)
{
CIR c;
printf("请输入圆心横坐标，x=");
scanf_s("%lf", &c.x);
printf("请输入圆心纵坐标，y=");
scanf_s("%lf", &c.y);
printf("请输入圆半径，r=");
scanf_s("%lf", &c.r);
return c;
}
void print_circle(CIR c)
{
printf("(x,y)=(%.2f, %.2f), r=%.2f\n", c.x, c.y, c.r);
}
void relationship(CIR c1, CIR c2)
{
double l;
l = abs((c1.x - c2.x)*(c1.x - c2.x) + (c1.y - c2.y)*(c1.y - c2.y));
if (l == c1.r + c2.r || l == sqrt(c1.r - c2.r))
printf("相切\n");
else if (abs(c1.r - c2.r)<l&&l<c1.r + c2.r)
printf("相交\n");
else printf("相离\n");
}
我把你代码改了，你看看吧，我觉得这样更好。你犯得小错误是写错函数名了

进入到一个人的程序中，难度很大的，最好自己根据codeblocks提示来查找错误