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#include <stdio.h>
#include <math.h>
 
 
int main()
{
    double v, a;
	printf("enter speed: \n");
    scanf("%lf", &v);
    printf("enter angle: \n");
    scanf("%lf", &a);
 
    printf("height is: %f  \n", hfunc(v,a));
    printf("length is: %f \n", dfunc(v,a));
 
    return 0;
}
 
double hfunc(double v, double a) {
   return ((pow(v,2))-pow(sin(a), 2))/(2*9.81);
}
 
double dfunc(double v, double a) {
    return ((pow(v,2)-(sin(2*a)))/9.81);
}

prog.c: In function ‘main’:
prog.c:13:33: warning: implicit declaration of function ‘hfunc’ [-Wimplicit-function-declaration]
     printf("height is: %f  \n", hfunc(v,a));
                                 ^~~~~
prog.c:13:25: warning: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘int’ [-Wformat=]
     printf("height is: %f  \n", hfunc(v,a));
                         ^
prog.c:14:32: warning: implicit declaration of function ‘dfunc’ [-Wimplicit-function-declaration]
     printf("length is: %f \n", dfunc(v,a));
                                ^~~~~
prog.c:14:25: warning: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘int’ [-Wformat=]
     printf("length is: %f \n", dfunc(v,a));
                         ^
prog.c: At top level:
prog.c:19:8: error: conflicting types for ‘hfunc’
 double hfunc(double v, double a) {
        ^~~~~
prog.c:13:33: note: previous implicit declaration of ‘hfunc’ was here
     printf("height is: %f  \n", hfunc(v,a));
                                 ^~~~~
prog.c:23:8: error: conflicting types for ‘dfunc’
 double dfunc(double v, double a) {
        ^~~~~
prog.c:14:32: note: previous implicit declaration of ‘dfunc’ was here
     printf("length is: %f \n", dfunc(v,a));
                                ^~~~~

Standard output is empty