/*visotomer v2.0*/
#include <stdio.h>
#define g 9.81
int main() {
    float high;
    printf("Put in high in metres (0 for exit):\n");
    scanf("%f", &high);
    printf("%f", high);
    while(high!=0)
    {
        for(float time=0;high > (g*time*time/2); time++){
        printf("%.0f sec - %.0f metres\n", time, (high-g*time*time/2));}
        printf("Put in high in metres (0 for exit):\n");
        scanf("%f", &high);
    }
    return 0;
}

#include <stdio.h>
int main() 
{
    char z;
    int counter = 0;
    printf("Put in a string:\n");
    while(z!='\n'){
        scanf("%c", &z);
        if(z==' ')
        counter++;
        else counter = 0;
        if(counter >= 2)
        {
            continue;
        }
        printf("%c", z);
    }
    return 0;
}

#include <stdio.h>
#include <ctype.h>
#define N 37
int main()
{
    char k, A[N]="A9B1C0DEF7G82HI4J3K5LMN6OPQRSTUVWXYZ";
    for (int i=0, counter=0; counter<10; i++)
    {
        if(isdigit(A[i]))
        {
            for(int j=36;j>0;j--)
            {
                if(isalpha(A[j]))
                {
                    k=A[i];
                    A[i]=A[j];
                    A[j]=k;
                    counter++;
                    break;
                }
            }
        }
    }
    
    for (int n=0; n<36; n++)
    {printf("%c", A[n]);}
    return 0;
}