C++习题整理1..docVIP

一，My Vector #include iostream #include iomanip #include vector using namespace std; void DisplayVector(vectorint A); void main() { vectorint a; int i; for(i=0;i10;i++) { //a.push_back((i+1)*10); a[i] = (i+1)*10; } cout向ò量?当獭?前°的?元a素?为a:endl; DisplayVector(a); cout向ò量?当獭?前°的?长¤度è为a:a.size()endl; cout向ò量?当獭?前°的?容╕量?为a:a.capacity()endl; vectorint::iterator p=a.begin()+2; a.erase(p); cout元a素?删?除y操ù作痢?完?成é后ó的?向ò量?为a:endl; DisplayVector(a); cout向ò量?当獭?前°的?长¤度è为a:a.size()endl; cout向ò量?当獭?前°的?容╕量?为a:a.capacity()endl; p=a.begin()+2; a.insert(p,20,3); cout元a素?插?入?操ù作痢?完?成é后ó的?向ò量?为a:endl; DisplayVector(a); cout向ò量?当獭?前°的?长¤度è为a:a.size()endl; cout向ò量?当獭?前°的?容╕量?为a:a.capacity()endl; } void DisplayVector(vectorint A) { int i; for(i=0;iA.size();i++) { coutsetw(5)leftA[i]; if ((i+1)%5 == 0) { coutendl; } } coutendl; } 二．输出格式 #include iomanip using namespace std; void main() { couthex10 15\n; coutdec; cout noshowpos12 155 showpos18\n; cout 121 156endl; cout noshowpos; //宽í度è填?充? coutsetw(10)setfill($); cout2356789endl; coutsetw(7); cout56789endl; cout.width(10); cout.fill(S); cout23.012356endl; double d1=123.0, d2=1.2345; coutsetprecision(5)d1endl; coutshowpointsetprecision(5)d1endl; coutshowpointsetprecision(2)d1endl; coutnoshowpointsetprecision(2)d1endl; coutsetprecision(5)d2endl; coutsetprecision(3)d2endl; coutfixedsetprecision(3)d2endl; coutfixedsetprecision(7)d2endl; coutscientificsetprecision(3)d2endl; coutscientificsetprecision(7)d2endl; } 三．文件 #include fstream #include iostream #include iomanip using namespace std; void main() { int i,temp; ifstream fin(abc.txt); ofstream fout(123.dat, ios::binary); if(fin != NULL fout != NULL) { fintemp; while(fin != NULL) { fout.write((char *) temp,sizeof(int)); fintemp; } } else { if(fin == NULL) coutError:cannot open file abc.txt endl; if(fout == NULL) coutError:cannot open file 123.dat endl; return; } f