Trouble Finding lowest value in array in C++ -

help me find out minimum value array in function4. getting 0 every time. value present @ first index of array minimum value. kindly review code , me solve problem.

#include <iostream> using namespace std; int count=0; void function1(int a[]) {  (count=0;count<100;count++) {         cin >> a[count];         if (a[count]==0)         break; } }   int function2 (int a[]) { int sum=0,avg=0;  (int n=0;n<count;n++) {     sum=sum+a[n]; }     avg=sum/count;     return avg;   }  //maximum value  int function3 (int a[]) {     int max1=a[0];     (int count=0;count<100;count++) {       if (a[count]>max1)         max1=a[count];       }        return max1;     }     //minimum value     int function4 (int a[]) {        int min1=a[0];     (int count=0;count<100;count++) {         if (a[count]<min1){         min1=a[count];}         }         return min1;      }  int main () {   int a[100]={0};   function1(a);  cout <<"average : "<<function2(a)<<'\n'; cout <<"maximum value : "<<function3(a) <<'\n'; cout <<"minimum value : "<<function4(a) << '\n';  } 

it looks trying learn programming itself, , not c++. if how c++ gets smaller element in container, i'd advise stl documentation std::min_element(). has been asked here before: how find minimum value vector?

but surely still need few hints before:

1. name functions intuitively. function4 terrible name function meaning find lowest/smallest/minimum value in container. how calling minimum?
2. allways search before posting. stackoverflow smart enough search while type.
3. the way pass array functions problem. have function makes assumptions on array size no guaranties. if change declaration a[100] a[10] program accessing data outside array bounds.there many solutions it. include parameter telling array size or use std::vector, example. 1.please study how parameters (specially arrays) can passed in c++. take @ passing arrays , functions safely , securely begin.
4. important: data being populated function1() through console input. ** are sure filling in 100 values in array , none zero? ** if have 0 in array , no negative inputs, minimum value 0!