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上面代碼有誤，本來switch語句是接收int型的，有死循環(huán)；有人建議改成接收字符，上面沒改完全，現(xiàn)在改完全了，但是會重復輸出，輸出如下

*** ACME checkbook-balancing program ***

Commands: a=clear, b=credit, c=debit, d=balance, e=exit

Enter command: b

Enter amount of credit: 10000

Enter command: Commands: a=clear, b=credit, c=debit, d=balance, e=exit

Enter command: d

Current balance: $10000.00

Enter command: Commands: a=clear, b=credit, c=debit, d=balance, e=exit

Enter command: 0

Commands: a=clear, b=credit, c=debit, d=balance, e=exit

Enter command: Commands: a=clear, b=credit, c=debit, d=balance, e=exit

Enter command:

代碼如下：

/* Balances a checkbook */

#include

int main(void)

{

char cmd;

float balance = 0.0f, credit, debit;

printf("*** ACME checkbook-balancing program ***\n");

printf("Commands: a=clear, b=credit, c=debit, ");

printf("d=balance, e=exit\n\n");

for (;;) {

printf("Enter command: ");

cmd = getchar();

switch (cmd) {

case 'a':

balance = 0.0f;

break;

case 'b':

printf("Enter amount of credit: ");

scanf("%f", &credit);

balance += credit;

break;

case 'c':

printf("Enter amount of debit: ");

scanf("%f", &debit);

balance -= debit;

break;

case 'd':

printf("Current balance: $%.2Lf\n",balance);

break;

case 'e':

return 0;

default:

printf("Commands: a=clear, b=credit, c=debit, ");

printf("d=balance, e=exit\n\n");

break;

}

}

}

總結

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