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# include<stdio.h>

int main(void)

{

         double x,y;

         printf("Enter x:");

         scanf("%lf",&x);

         if(x<0){

                   y=0;

         }

         else if(x<=15){

                   y=4*x/3;

         }

         else{

                   y=2.5*x-10.5;

         }

         printf("f(%.2f)=%.2f\n",x,y);

         return 0;

}