問題一百三十七：計算坐標上兩點之間的距離

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[plain]  #include <stdio.h> 
#include <stdlib.h> 
#include <math.h> 
 
float distance(int a, int b, int c, int d); 
 
int main(int argc, char *argv[]) 
{ 
      int a; 
      int b; 
      int c; 
      int d; 
       
      printf("Please enter the first coordinate points x:");     //輸入第一個點  
      scanf("%d %d", &a, &b); 
      printf("Please enter the second coordinate points y:");    //輸入第二個點 
      scanf("%d %d", &c, &d); 
       
      printf("The distance between two points is %f\n", distance(a, b, c, d)); 
       
      system("PAUSE");   
      return 0; 
} 
 
// Calculate distances 
 
float distance(int a, int b, int c, int d)     //計算兩點的距離  
{ 
      int   x; 
      int   y; 
      float distance; 
       
      x=abs(a-c); 
      y=abs(b-d); 
      distance=sqrt(x*x+ y*y);      
       
      return distance; 
}