EECE 230 Exam 2 with Solution, Fall 2011

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 #include<iostream> #include<fstream> using namespace std; void main() { ifstream input; ofstream output; char infile[100];//char array to store the name of the input file cout<<"Please enter the name of the file you want to input from:"<<endl; cin.get(infile,100); input.open(infile); output.open("OutputfFile.txt"); if(!input) cout<<"Error in reading file"<<endl; else{ int i,j; int x; for(i=0; i<5; i++) { for(j=0; j<=i; j++) { input>>x; output<<x<<" "; } output<<endl; } cout<<"Please check the outputfile"<<endl; output.close(); input.close(); } } #include<iostream> #include<cstring> using namespace std; void strAssfouri(char []); void main() { char s[500]; cout<<"Enter a string:"<<endl; cin.get(s,500);//read a line that could contain spaces max length 499 characters and store in s strAssfouri(s);//function call cout<<"Assfouri: "<<endl; cout<<s<<endl; } void strAssfouri(char s[]) { int leng=strlen(s); int i;//index for the original string char temp[500];//temporary string int tempindex=0;//index for temporary string for(i=0;i<leng;i++) { if(s[i]==' ') { temp[tempindex]=s[i]; tempindex++; } else { temp[tempindex]=s[i]; tempindex++; temp[tempindex]='s'; tempindex++; } } temp[tempindex]='\0'; strcpy(s,temp);//copy the temporary string to the initial string } #include<iostream> using namespace std; int rec10a(int [],int , int); void main() { int A[100]; int i=0; cout<<"Please enter an array of integers ending with a character:"<<endl; while(cin) { cin>>A[i]; i++; } i--;//size of array cin.clear(); cout<<"The number of integers greater than or equal to 10 is: "<<rec10a(A,0,i)<<endl; } int rec10a(int A[],int start, int end) { if(start==end) return 0;//base case to stop the recursive function else if(A[start]>=10) return (1+rec10a(A,start+1,end)); else return rec10a(A,start+1,end);//a case for A[start] is not greater or equal to 10 } #include<iostream> using namespace std; void rec10b(int [],int , int ,int &,int &); void main() { int A[100]; int n=0; int positive=0; int negative=0; cout<<"Please enter an array of integers ending with a character:"<<endl; while(cin) { cin>>A[n]; n++; } n--;//size of array cin.clear(); rec10b(A,0,n, positive, negative); cout<<"The number of integers greater than or equal to 10 is: "<<positive<<endl; cout<<"The number of integers less than or equal to -10 is: "<<negative<<endl; } void rec10b(int A[],int start, int end, int &positive, int &negative) { if(start==end)//base case to stop return; else{ if(A[start]>=10 ) positive++; else if(A[start]<=-10) negative++; rec10b(A,start+1,end,positive,negative); } } 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14