Function practice, C (gcc)

Function practice

//gcc 5.4.0
/*
C has two ways to list function, before main, after main
prototypes
by reference
by value

#include <stdio.h>
int findMax(int a,int b){

if (a <b)
 return (b);
 else return (a);
}
int main(void)
{
 int x =5;
 int y = 10;
 printf ("Max of %d and %d is %d\n", x, y, findMax(x,y));
 x = 100; y = -1;
 printf ("Max of %d and %d is %d\n", x, y, findMax(x,y));

return 0;
}

/*
#include <stdio.h>
int sumaray(int myparam[], int limit){
 int i;
 int sum=0;
 for(i=0; i < limit; ++i)
 sum += myparam[i];
 return (sum);
}
void main(void)
{
 int myarr1[5] = {1,2,3,4,5};
 int myarr2[8] = {1,2,3,4,5,6};
 printf ("sum=%d\n", sumaray(myarr1, 5));
 printf ("sum=%d\n", sumaray(myarr2, 8));
}

#include <stdio.h>
double square(double a){
    double base;
    base = a*a;
    return(base);
}
double volume(double b, double h){
    double vol;
    vol=b*h/3;
    return(vol);
}
int main(void){
    double a=7.7;
    double h=3.8;
    double v;
    v = volume(square(a),h);
    printf("volume is %lf\n", v);
    return 0;
}

#include  <stdio.h>
double square(double a){
    
    
    return (a*a);
}

double volume(double height, double length){
    
    return (square(length)*height/3.0);
}
int main(void)
{
    double height = 4;
    double length = 5.3;
    
    printf("%lf",volume(height,length));
    return 0;
}
*/


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