我正在尝试创建一个获取多个电阻值输入的函数。在我的主要功能中,程序要求用户询问需要多少电阻。用户需要的电阻数量将成为程序要求用户输入电阻值的次数。问题是我应该使用什么循环来制作错误声明并让用户再次输入值。输入只接受整数。这是代码:
#include <stdio.h>
#include <ctype.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#define MAXSIZE 500
int resistors(int rescount, int *val_res);
int validate ( char *a )
{
unsigned x;
for ( x = 0; x < strlen ( a ); x++ )
if ( !isdigit ( a[x] ) )
return 1;
return 0;
}
int main()
{
int numres;
int resistance[MAXSIZE];
char resist[MAXSIZE];
do
{
printf("How many resistors do you want to place in the circuit?\n");
if (fgets(resist, sizeof(resist), stdin) != NULL)
{
resist[strlen (resist) - 1] = '\0';
if(validate (resist) == 0)
{
numres = atoi(resist);
}
}
} while(numres < 1 || numres > 100);
resistors(numres, resistance);
return 0;
}
int resistors(int rescount, int *val_res)
{
char resistor_value[MAXSIZE];
int z;
printf("Please input the value of resistors:\n");
for(z = 1; z < (*val_res); z++)
{
printf("\tPlease input Resistor #%d: \n", z);
if (fgets(resistor_value, sizeof(resistor_value), stdin) != NULL)
{
resistor_value[strlen (resistor_value) - 1] = '\0';
if(validate (resistor_value) == 0)
{
val_res[z-1] = atof(resistor_value);
}
}
do{
printf("\tInvalid Resistance\n");
printf("\tRe-input Resistor #%d: \n", z);
if (fgets(resistor_value, sizeof(resistor_value), stdin) != NULL)
{
resistor_value[strlen (resistor_value) - 1] = '\0';
if(validate (resistor_value) == 0)
{
val_res[z-1] = atof(resistor_value);
}
}
}while(val_res[z-1] < 0);
}
}
输出应该是这样的:
你想在电路中放置多少个电阻?
3
请输入电阻值:
请输入电阻#1:
A B C D
无效抵抗!
重新输入电阻#1:
5
请输入电阻#2:
6
...
ETC
这不会发生在我的代码上。请帮忙谢谢!