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#include<stdio.h>
 
int main (){
 
	printf("\n\nEnter the size of all sides of the triangle : ");
	scanf("%f%f%f",&a,&b,&c);
 
	perimeter = a + b + c;
	printf("Perimeter of triangle is: %.3f",perimeter);
 
return (0);
 
}

prog.c: In function 'main':
prog.c:6:18: error: 'a' undeclared (first use in this function)
  scanf("%f%f%f",&a,&b,&c);
                  ^
prog.c:6:18: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:21: error: 'b' undeclared (first use in this function)
  scanf("%f%f%f",&a,&b,&c);
                     ^
prog.c:6:24: error: 'c' undeclared (first use in this function)
  scanf("%f%f%f",&a,&b,&c);
                        ^
prog.c:8:2: error: 'perimeter' undeclared (first use in this function)
  perimeter = a + b + c;
  ^

Standard output is empty