решение

#include <iostream.h>
#include<conio.h>
#include<stdlib.h>
#include <stdio.h>
#include <math.h>
 
void main(){
    
float x,b,z,y;
while(1){
    cout<<"Input your X value:"<<endl;
    cin>>x;
    cout<<"Input your Z value:"<<endl;
    cin>>y;
    cout<<"Input your B value:"<<endl;
    cin>>z;
    x=(powf(z,b)/sqrtf(x))+fabsf(b/2);
    cout<<"X="<<(int)x<<endl;
    y=(1/cosf(x))+logf(tanf(x/2));
    cout<<"Y="<<(int)y<<endl;
        cout<<"Press key to start again...."<<endl;  
    getch();
    }
}

while(1){
    while(1){
    cout<<"Input your Z value:"<<endl;
    cin>>z;
    if(z!=0)break;
    else cout<<"Error! Z must be non zero "<<endl;
    }
    cout<<"Input your B value:"<<endl;
    cin>>b;
    x=(powf(z,b)/sqrtf(z))+fabsf(b/2);
    cout<<"X="<<(int)x<<endl;
    y=(1/cosf(x))+logf(tanf(x/2));
    cout<<"Y="<<(int)y<<endl;
    getch();
    }