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#include <stdio.h>
 
int main ()
{
/* variable definition: */
double length, width, area, perimeter;
double average;
 
/* Read the inputs from the user */
printf("Enter the length of the rectangle:12.5 ");
scanf("%lf", &length);
printf("Enter the width of the rectangle:12.5 ");
scanf("%lf", &width);
if (length >=  && width >= )
area = length * width;
perimeter = 2 * (length + width);
 
printf("Area: %lf\n" , area );
printf("Perimeter: %lf\n" , perimeter);
return 0;
}

prog.c: In function ‘main’:
prog.c:14:12: error: invalid operands to binary >= (have ‘double’ and ‘void *’)
 if (length >=  && width >= )
            ^~  ~~~~~~~~
prog.c:14:28: error: expected expression before ‘)’ token
 if (length >=  && width >= )
                            ^
prog.c:14:1: error: label ‘width’ used but not defined
 if (length >=  && width >= )
 ^~
prog.c:7:8: warning: unused variable ‘average’ [-Wunused-variable]
 double average;
        ^~~~~~~
prog.c:11:1: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
 scanf("%lf", &length);
 ^~~~~~~~~~~~~~~~~~~~~
prog.c:13:1: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
 scanf("%lf", &width);
 ^~~~~~~~~~~~~~~~~~~~

Standard output is empty