关于这一点，我是新手（这是我写过的第一个程序），我不确定这些论坛是否是正确的问题，但我想知道是否有人可以帮忙解决我的问题。
当我从计算器中选择问卷选项时，第一个问题正常工作，然后程序就结束了。嵌套的switch语句不会运行。
int main () {
/** Declaring variables (multiple variables can be declared together providing they are the same data type). **/
int selectOperation,firstValue,secondValue,questInput,userScore,nextQuestion;
printf("\n***Welcome back, sir!***\n");
do {
printf("\n***Please select your desired operation by inputting the associated value***\n\n");
printf(" [1]: Addition \n [2]: Subtraction \n [3]: Division \n [4]: Multiplication \n [5]: Questionnaire \n");
/** Asks the user to input an integer and stores the value in the selectOperation variable. **/
printf("\nEnter value: ");
scanf("%d", &selectOperation);
/** While the selectOperation variable is not equal to 1, 2, 3, 4 or 5 continue to run this loop. **/
/** The loop will continue to run until the user selects an operation. **/
} while((selectOperation != 1) && (selectOperation != 2) && (selectOperation != 3) && (selectOperation != 4) && (selectOperation != 5));
if ((selectOperation == 1) || (selectOperation == 2) || (selectOperation == 3) || (selectOperation == 4)) {
/** Input first value **/
printf("\nPlease enter the first value you would like to process:\n");
printf("\nEnter value: ");
scanf("%d", &firstValue);
/** Input second value **/
printf("\nPlease enter the second value you would like to process:\n");
printf("\nEnter value: ");
scanf("%d", &secondValue);
}
/** If the selectOperation variable is equal to the case value the code for that case will be ran, for
example if selectOperation's current value is 1 the text "You have selected addition" will print." **/
switch(selectOperation) {
case 1: /** Operation: Addition **/
printf("\nYou have selected addition! Your answer can be found below:\n\n");
/** Adds the stored values of the variables firstValue and secondValue and outputs the workings/result. **/
printf("%d + %d = %d\n",firstValue,secondValue,firstValue+secondValue);
break;
case 2: /** Operation: Subtraction **/
printf("\nYou have selected subtraction! Your answer can be found below:\n\n");
/** Subtracts the value of secondValue from firstValue and outputs the workings/result. **/
printf("%d - %d = %d\n",firstValue,secondValue,firstValue-secondValue);
break;
case 3: /** Operation: Division **/
printf("\nYou have selected division! Your answer can be found below:\n\n");
/** Divides firstValue by secondValue and outputs the workings/result. **/
printf("%d / %d = %d\n",firstValue,secondValue,firstValue/secondValue);
break;
case 4: /** Operation: Multiplication **/
printf("\nYou have selected multiplication! Your answer can be found below:\n\n");
/** Multiplies firstValue by secondValue and outputs the workings/result. **/
printf("%d * %d = %d\n",firstValue,secondValue,firstValue*secondValue);
break;
case 5: /** Questionnaire **/
printf("\nQuestion 1: What is 48 * 3?\n");
printf("\nEnter value: ");
scanf("%d", &questInput);
if (questInput == 144) {
printf("That's correct!\n");
userScore = userScore + 1;
nextQuestion = nextQuestion + 1;
}
else {
printf("That's incorrect!\n");
nextQuestion = nextQuestion + 1;
}
while(nextQuestion > 0 && nextQuestion < 5) {
switch(nextQuestion) {
case 1:
printf("\nQuestion 2: What is 36 / 6?\n");
printf("\nEnter value: ");
scanf("%d", &questInput);
if (questInput == 6) {
printf("That's correct!\n");
userScore = userScore + 1;
nextQuestion = nextQuestion + 1;
}
else {
printf("That's incorrect!\n");
nextQuestion = nextQuestion + 1;
}
break;
case 2:
printf("\nQuestion 3: What is 1526 + 49?\n");
printf("\nEnter value: ");
scanf("%d", &questInput);
if (questInput == 1575) {
printf("That's correct!\n");
userScore = userScore + 1;
nextQuestion = nextQuestion + 1;
}
else {
printf("That's incorrect!\n");
nextQuestion = nextQuestion + 1;
}
break;
case 3:
printf("\nQuestion 4: What is 5 * (5 + 15)?\n");
printf("\nEnter value: ");
scanf("%d", &questInput);
if (questInput == 100) {
printf("That's correct!\n");
userScore = userScore + 1;
nextQuestion = nextQuestion + 1;
}
else {
printf("That's incorrect!\n");
nextQuestion = nextQuestion + 1;
}
break;
case 4:
printf("\nQuestion 5: What is 30 + 21?\n");
printf("\nEnter value: ");
scanf("%d", &questInput);
if (questInput == 51) {
printf("That's correct!\n");
userScore = userScore + 1;
nextQuestion = nextQuestion + 1;
}
else {
printf("That's incorrect!\n");
nextQuestion = nextQuestion + 1;
}
break;
}
}
}
}
答案 0 :(得分：0)
这就是我的意思，改变
int selectOperation,firstValue,secondValue,questInput,userScore,nextQuestion;
到
int selectOperation,firstValue,secondValue,questInput,userScore = 0,nextQuestion = 0;
选项1到4执行一次，然后程序退出。选项5询问一系列问题，然后程序退出。