我有这个程序，在第一个循环期间它按预期工作，但从第二个循环开始它不执行第一个 scanf。没有教过我们指点，所以不知道能不能解决问题。我应该尝试使用另一种循环语法(例如 for)来解决这个问题吗？如有任何帮助，我们将不胜感激。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[])
{
char type[20];
int amount;
double price;
double priceP;
double priceG;
double priceA;
double pricePL;
double priceC;
price=0;
char frouro[4]= "add";
char payment[5];
double refund;
do{
printf("What kind of material do you want to recycle today?. It has to be either paper , glass, aluminium, plastic or cloth\n");
scanf(" %s" , &type);
printf("how many materials do you want to recycle today? It has to be more than 1 and a maximum of 10\n");
scanf(" %d" , &amount);
if (strcmp(type, "paper") == 0)
{
priceP = priceP + amount * 0.10;
}
if (strcmp(type, "glass") == 0)
{
priceG =priceP + amount * 0.20;
}
if (strcmp(type, "aluminium") == 0)
{
priceA = priceA + amount * 0.15;
}
if (strcmp(type, "plastic") == 0)
{
pricePL = pricePL +amount * 0.05;
}
if (strcmp(type, "cloth") == 0)
{
priceC = priceC + amount * 0.50;
}
printf("do you want to do anything else?\n");
scanf(" %c", &frouro);
}while(strcmp(frouro,"add")==0 && strcmp(frouro,"end")!=0);
return 0;
}
最佳答案
将 scanf("%c", &frouro); 更改为 scanf("%s", &frouro);。
由于您存储 1 个字符，因此在 while 条件检查期间它将始终为 false。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[])
{
char type[20];
int amount;
double price;
double priceP;
double priceG;
double priceA;
double pricePL;
double priceC;
price=0;
char frouro[4]= "add";
char payment[5];
double refund;
do{
printf("What kind of material do you want to recycle today?. It has to be either paper , glass, aluminium, plastic or cloth\n");
scanf(" %s" , &type);
printf("how many materials do you want to recycle today? It has to be more than 1 and a maximum of 10\n");
scanf(" %d" , &amount);
if (strcmp(type, "paper") == 0)
{
priceP = priceP + amount * 0.10;
}
if (strcmp(type, "glass") == 0)
{
priceG =priceP + amount * 0.20;
}
if (strcmp(type, "aluminium") == 0)
{
priceA = priceA + amount * 0.15;
}
if (strcmp(type, "plastic") == 0)
{
pricePL = pricePL +amount * 0.05;
}
if (strcmp(type, "cloth") == 0)
{
priceC = priceC + amount * 0.50;
}
printf("do you want to do anything else?\n");
scanf("%s", &frouro);
}while(strcmp(frouro,"add")==0 && strcmp(frouro,"end")!=0);
return 0;
}
关于c - do while 循环中省略了 scanf，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59020035/