c语言cythe头文件,C语言求助！！！

#include

main()

{

float x, y;

printf("please input coordinate value(like x,y):");

scanf("%f,%f", &x, &y);

if( x == 0 && y == 0 ) printf("(%f,%f) is on the original point.\n", x, y);

else if( x == 0 ) printf("(%f,%f) is on the y axis.\n", x, y);

else if( y == 0 ) printf("(%f,%f) is on the x axis.\n", x, y);

else if( x > 0 && y > 0 ) printf("(%f,%f) is in quadrant I.\n", x, y);

else if( x > 0 && y < 0 ) printf("(%f,%f) is in quadrant IV.\n", x, y);

else if( x < 0 && y > 0 ) printf("(%f,%f) is in quadrant II.\n", x, y);

else if( x < 0 && y < 0 ) printf("(%f,%f) is in quadrant III.\n", x, y);

}