我正在尝试输出最终测试函数中每次加法，减法，乘法，除法的分数。以及问的总数。 **任何帮助将不胜感激
BTW这只是使用本地功能，并通过引用传递分数。 IT应该输出您正确回答的答案数。
还有一种方法可以阻止程序让您多次选择选项吗？
这是我到目前为止所得到的：
#include < iostream >
#include < iomanip >
#include < stdlib.h >
#include < time.h >
#include < stdlib.h >
using namespace std;
int addition(int addscore);
int subtraction(int subscore);
int multiplication(int multiscore);
int division(int divscore);
int endtest(int & addscore, int & subscore, int & multiscore, int & divscore);
main() {
int end_final = 0;
do {
int addscore, subscore, multiscore, divscore;
char choice;
cout << "A- " << "Addition\n";
cout << "B- " << "Subtraction\n";
cout << "C- " << "Multiplication\n";
cout << "D- " << "Division\n";
cout << "E- " << "End of Test\n";
cin >> choice;
cout << endl << endl;
switch (choice) {
case 'A':
case 'a':
addition(addscore);
break;
case 'B':
case 'b':
subtraction(subscore);
break;
case 'C':
case 'c':
multiplication(multiscore);
break;
case 'D':
case 'd':
division(divscore);
break;
case 'E':
case 'e':
endtest(addscore, subscore, multiscore, divscore);
break;
}
}
while (end_final != 1);
return 0;
}
int addition(int addscore) {
int iRandom;
// initialize random seed:
srand(time(NULL));
int answer;
cout << "You have chosen addition\n";
int randnum1, randnum2;
int total = 0;
for (int i = 1; i <= 5; i++) {
randnum1 = rand() % 15 + 1;
randnum2 = rand() % 15 + 1;
cout << randnum1 << " " << "+" << " " << randnum2 << " " << "= ";
cin >> answer;
cin.ignore(80, '\n');
total++;
if (answer == randnum1 + randnum2) {
cout << "Correct! \n";
addscore++;
} else {
cout << "Incorrect \n";
}
}
}
int subtraction(int subscore) {
int iRandom;
// initialize random seed:
srand(time(NULL));
int answer;
cout << "You have chosen subtraction\n";
int randnum1, randnum2;
int total = 0;
while (total != 5) {
randnum1 = rand() % 20 + 1;
randnum2 = rand() % 20 + 1;
if (randnum1 >= randnum2) {
cout << randnum1 << " " << "-" << " " << randnum2 << " " << "= ";
cin >> answer;
cin.ignore(80, '\n');
total++;
if (answer == randnum1 - randnum2) {
cout << endl;
cout << "Correct!\n ";
subscore++;
} else {
cout << "Incorrect\n ";
}
}
}
}
int multiplication(int multiscore) {
int iRandom;
int total = 0;
// initialize random seed:
srand(time(NULL));
int answer;
cout << "You have chosen Multiplication\n";
int randnum1, randnum2;
for (int i = 1; i <= 5; i++) {
randnum1 = rand() % 20 + 1;
randnum2 = rand() % 20 + 1;
cout << randnum1 << " " << "x" << " " << randnum2 << " " << "= ";
cin >> answer;
cin.ignore(80, '\n');
total++;
if (answer == randnum1 * randnum2) {
cout << endl;
cout << "Correct! \n";
multiscore++;
} else {
cout << "Incorrect\n ";
}
}
}
int division(int divscore) {
int iRandom;
// initialize random seed:
srand(time(NULL));
int answer;
cout << "You have chosen Division\n";
int randnum1, randnum2;
int total = 0;
while (total != 5) {
randnum1 = rand() % 13 + 1;
randnum2 = rand() % 13 + 1;
if (randnum1 % randnum2 == 0) {
cout << randnum1 << " " << "/" << " " << randnum2 << " " << "= ";
cin >> answer;
cin.ignore(80, '\n');
total++;
if (answer == randnum1 / randnum2) {
cout << endl;
cout << "Correct! \n";
divscore++;
} else {
cout << "Incorrect\n ";
}
}
}
}
int endtest(int & addscore, int & subscore, int & multiscore, int & divscore) {
int total = 0;
cout << endl << endl;
cout << "Addition" << " " << addscore++ << endl;
cout << "Subtraction" << " " << subscore << endl;
cout << "Multiplication" << " " << multiscore << endl;
cout << "Division" << " " << divscore << endl;
cout << "Total" << " " << total << endl;
}
答案 0 :(得分：1)
要澄清代码，请声明枚举
enum { ADDITION=0, SUBTRACTION, MULTIPLICATION, DIVISION };
您可以拥有全局数组
int used[] = { 0,0,0,0 }; // not used
int total[] = { 0,0,0,0 }; // total questions per operation
int score[] = { 0,0,0,0 }; // score per operation
然后，在do {
if ( ! used[ADDITION]) cout << "A- " << "Addition\n";
然后在switch
case 'A':
case 'a':
used[ADDITION] = 1; // tells addition was used
addition(addscore);
break;
添加代码变为
int addition(int addscore) {
int iRandom;
// initialize random seed:
srand(time(NULL));
int answer;
cout << "You have chosen addition\n";
int randnum1, randnum2;
total[ADDITION] = 0; // should not be
score[ADDITION] = 0; // ...necessary (but in case you call it again)
for (int i = 0; i < 5 ; i++) {
randnum1 = rand() % 15 + 1;
randnum2 = rand() % 15 + 1;
cout << randnum1 << " " << "+" << " " << randnum2 << " " << "= ";
cin >> answer;
cin.ignore(80, '\n');
total[ADDITION]++; // total is incremented for Addition
if (answer == randnum1 + randnum2) {
cout << "Correct! \n";
score[ADDITION]++; // score is incremented
} else {
cout << "Incorrect \n";
}
}
}
endtest 成为
int endtest() {
cout << endl << endl;
if (used[ADDITION]) cout << "Addition" << " " << score[ADDITION] << " / " << total[ADDITION] << endl;
// same for SUBTRACTION ...
int grandtotal = total[ADDITION] + ....;
cout << "Grand Total" << " " << grandtotal << endl;
}
endtest ，并像那样调用
int endtest();
...
endtest();
由于这是C ++，你也可以创建一个类Operation，然后每个操作创建一个子类，保存操作的名称并覆盖＆＃39;执行＆＃39;执行特定操作的方法，然后声明包含每个操作的实例的父类的数组...
根据OP的评论，在do {
// initialize variables to zero
int addscore=0, subscore=0, multiscore=0, divscore=0;
在开关
中 case 'A':
case 'a':
used[ADDITION] = 1; // tells addition was used
addition( &addscore ); // <== gives the pointer to that variable
break;
然后另外代码
int addition(int *addscore) { // <== gets a pointer
int iRandom;
// initialize random seed:
srand(time(NULL));
int answer;
cout << "You have chosen addition\n";
int randnum1, randnum2;
total[ADDITION] = 0; //
score[ADDITION] = 0; // using your way, this is not necessary anymore
for (int i = 0; i < 5 ; i++) {
randnum1 = rand() % 15 + 1;
randnum2 = rand() % 15 + 1;
cout << randnum1 << " " << "+" << " " << randnum2 << " " << "= ";
cin >> answer;
cin.ignore(80, '\n');
total[ADDITION]++; // total is incremented for Addition
if (answer == randnum1 + randnum2) {
cout << "Correct! \n";
// score[ADDITION]++; // score is incremented (see above)
*addscore++; // <== increment variable pointed to by pointer
} else {
cout << "Incorrect \n";
}
}
}