Find largest digit in c program

Find largest digit in c program mumbers (positive,nagative,integer,double numbers) from the keyboard and prints area,largest number,negcount,reverse,average.*/ //including header file #include using namespace std; // main declaration void main() { //declaring variables int num; int sum1=0; float sum2=0; int negcount=0; int i=0; int largest; int smallest; float average=0.0; int temp1=0; int temp2=0; float area=0.0; int radius; int large; int small; int temp3; int b; int temp4; int temp; int poscount=0; float pi=3.14; for(i=0; i { //Reading numbers from user cout cin >> num; if(i==0) { largest=num; smallest=num; temp=num; } if(i==1) temp3=num; if( num > 0 )//Considering positive numbers { if(poscount==0) { large=num; small=num; } sum1= sum1+num; poscount++; } else { // considering negative numbers if(negcount==0) temp1=num; if(negcount==1) temp2=num; if(temp2 sum2=temp1+temp2; average = sum2/2; negcount++; } // checking the largest number of given 8 numbers if ( num { smallest = num; } if ( num > largest ) { largest = num; } //checking the smallest positive number if(num>0) { if ( num { Find largest digit in c program small = num; } if ( num >= large ) { large = num; } radius=small; area=pi*(radius*radius);//calculating the area of the circle } // reversing the first two numbers entred b=temp-((temp/10)*10); temp4=b; } //printing outputs for given inputs cout cout cout cout cout cout cout cout }