C++ 迴圈問題 - 伊莉討論區

#include <iostream>
using namespace std;
int main() {
int n = 0,total=0,a=0;
for(n = 1; total < 1e20 ;n++)
a= n+ 1
total = a + 1;
if(total > 1e20)
cout << " " << total;
return 0;
system("pause");
}

複製代碼

Private Sub Command1_Click()
Cls
Dim a As Double
Dim b As Double
Dim c As Double
a = InputBox("請輸入正整數")
b = 0
c = 0
Do Until b > a
c = c + 1
b = b + c
Loop
Print c
End Sub

複製代碼

# include <iostream>
using namespace std ;
string intput_num_string() { // 限制 input 的 string
string str = "" , output_string = "" ;
int quit = 1 , transfer = 0 ;
while( quit != 0 ) {
cin >> str ;
if ( str == "quit" ) exit( 0 ) ;
quit = 0 ;
for ( int i = 0 ; i < str.length() ; i++ ) {
if ( str[ i ] >= 48 && str[ i ] < 58 ) ;
else quit = 1 ;
}
if ( quit == 1 ) cout << "抱歉，請輸入數字，或輸入 quit 離開." << endl ;
} // while( quit != 0)
for ( int i = 0 ; i < str.length() ; i++ ) {
if ( str[ i ] != 48 && transfer == 0 ) transfer = 1 ;
if ( transfer == 1 ) output_string += str[ i ] ;
} // for ( int i = 0 ; i < str.length() ; i++ )
if ( output_string == "" ) output_string += "0" ;
return output_string ;
} // intput_num_string()
string Add_str( string str1, string str2 ) { // 做兩數字的相加，但兩數字的 type 為 string
string temp = "" , transfer = "0" ;
int A = 0, B = 0, sum = 0 , carrier = 0;
if ( str1.length() < str2.length() ) {
temp = str1 ;
str1 = str2 ;
str2 = temp ;
} // if ( str1.length() > str2.length() )
temp = "" ;
for ( int i = 0 ; i < str1.length() ; i++ ) {
A = str1[ str1.length() - 1 - i ] - 48 ;
if ( i > str2.length() - 1 ) B = 0 ;
else B = str2[ str2.length() - 1 - i ] - 48 ;
sum = A + B + carrier ;
//temp += temp[ temp.length() - 1 ] ;
// for ( int j = 1 ; j < temp.length() ; j++ ) temp[ temp.length() - 1 - j ] = temp[ temp.length() - 2 - j ] ;
temp += ( char ) ( sum % 10 ) + 48 ;
if ( sum >= 10 ) carrier = 1 ;
else carrier = 0 ;
if ( i == str1.length() - 1 )
if ( carrier == 1 )
temp += ( char ) 1 + 48 ;
} // for ( int i = str1.length() - 1 ; i >= 0 ; i-- )
for ( int i = 0 ; i < temp.length() / 2 ; i++ ) {
transfer[ 0 ] = temp[ i ] ;
temp[ i ] = temp[ temp.length() - 1 - i ] ;
temp[ temp.length() - 1 - i ] = transfer[ 0 ] ;
} // for ( int i = 0 ; i < temp.length() / 2 ; i++ )
return temp ;
} // Add_str()
int main() {
string count = "0", sum = "0" ;
int quit = 1 ;
// 運算 1+2+3+4+5+......n > 10*20
while( quit != 0 ) {
count = Add_str( count , "1" ) ;
sum = Add_str( sum , count ) ;
if ( sum.length() >= 21 ) {
if ( sum == "100000000000000000000" ) ;
else quit = 0 ;
} // if ( sum.length() >= 21 )
cout << sum << endl ;
} // while( quit != 0 )
cout << count << endl ;
system( "pause" ) ;
return 0 ;
} // main()

複製代碼