Distance between coordinates in c language

//The code just written has passed the test. If you have any questions, please communicate.

//enter ctrl+z to end the input.

# include & ltstdio.h & gt

# include & ltmath.h & gt

int？ main(){

Floating? x 1，y 1，？ x2，？ y2；

while(scanf("%f？ %f？ %f？ %f "，& ampx 1，？ & ampy 1，？ & ampx2，？ & ampy2)！ =EOF){

printf("%.2f\n "，sqrt((x 1-x2)*(x 1-x2)？ +? (y 1-y2)？ *? (y 1-y2))；

}

Return? 0;

}