This is the picture I've got from creek, and edited a little bit :)

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//Made by Hyensoo Choi(John) /*if you enter coordinate of two point in linear function, it will give you back it's slope!*/ #include<stdio.h> float main() {     while(1)     {         float x_increase, y_increase;         float x_1=0, x_2=0, y_1=0, y_2=0;         float a;                  printf("Enter the coordinate of first point ex)1 3\n>>>");         scanf("%f%f", &x_1, &y_1);         printf("Enter the coordinate of second point\n>>>");         scanf("%f%f", &x_2, &y_2);                  x_increase=x_1-x_2;         y_increase=y_1-y_2;         a=y_increase/x_increase;                  printf("%f", a);         system("pause");         printf("\n\n");     }          return 0.0; } Colored by Color Scripter

cs

This is the program which prints slope of linear function!
I think it works only for integer, but I like it!
Yay!!

Start!