[英]Why does this program crash when I run through the loop a 2nd time?
尽我所能解决这个难题,我想我正在失去理智! 谁能帮助我理解为什么我第二次运行循环时该程序崩溃?
我可以运行一次交互式循环,并将输入的值写到文件中。 但是,当我第二次尝试通过循环时,程序会阻塞。
// C Libraries Used
#include <stdio.h>
#include <math.h>
#include <string.h>
// Constant definitions
const float OTPAYFACTOR = 1.5;
const float REGWORKWKHRS = 40;
FILE *payfile; // report file (for output)
// Variable declerations
char deptname [21];
char firstname [10];
char lastname [10];
char fullname [47];
float hrsworked;
float hrwage;
float reghrsworked;
float othrsworked;
float otwage;
float grosswage;
int count;
char again;
// Function Prototypes
//**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~
// M A I N F U N C T I O N
//**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~**~~
int main (void){
payfile = fopen("c:\\class\\mod6\\ethan-pay.txt","w"); // Open disk file
printf("Mountain Pacific Corporation\nDepartment Salary Program\n\n");
printf("Please enter the name of the department: ");
scanf("%s", deptname);
count = 0; // Initialize this "counting" variable to zero to start
printf("%s", deptname);
printf("\n");
do {
printf("Enter employee #%d: ", count+1);
scanf("%s %s", firstname, lastname);
fscanf(payfile,"%s %s", firstname, lastname);
strcpy(fullname, firstname);
strcat(fullname, " ");
strcat(fullname, lastname);
printf("Enter the hourly wage of %s: ", fullname);
scanf("%f", &hrwage);
fscanf(payfile,"%f", &hrwage);
printf("Enter total number of hours: ");
scanf("%f", &hrsworked);
fscanf(payfile,"%f", &hrsworked);
if (hrsworked <= REGWORKWKHRS){ //
reghrsworked = hrsworked;
othrsworked = 0;
otwage = hrwage * OTPAYFACTOR;
grosswage = hrwage*reghrsworked;
}
else{
reghrsworked = REGWORKWKHRS;
othrsworked = hrsworked - REGWORKWKHRS;
otwage = hrwage * OTPAYFACTOR;
grosswage = (reghrsworked * hrwage) + (othrsworked * otwage);
}
fprintf(payfile,"%-22s%0.1f ($%0.2f) %6.1f ($%0.2f) $%-4.2f\n", fullname, reghrsworked, hrwage, othrsworked, otwage, grosswage);
printf("\nThank you. Process another employee? ");
scanf ("%s", &again);
printf("\n");
count++; // Increment the counting variable
} while (again == 'Y'|| again == 'y' || again != 'N' && again != 'n');
printf("End of processing.\n");
fclose(payfile);
return 0;
}
我不明白您为什么要扫描用于保存结果的文件:
scanf("%s %s", firstname, lastname);
fscanf(payfile,"%s %s", firstname, lastname);
// ...
scanf("%f", &hrwage);
fscanf(payfile,"%f", &hrwage);
// ...
scanf("%f", &hrsworked);
fscanf(payfile,"%f", &hrsworked);
您所做的将擦除先前的值。 只需删除对fscanf()
所有调用即可。
我强烈建议您更改代码习惯,应避免全局操作,仅在需要它们时声明变量,不要忽略函数中的错误代码, 向scanf()
提供它可以使用的最大大小 ,等等。
示例可能不完美:
#include <stdio.h>
#include <string.h>
#define OTPAYFACTOR 1.5
#define REGWORKWKHRS 40
int main(void) {
printf("Mountain Pacific Corporation\nDepartment Salary Program\n\n"
"Please enter the name of the department: ");
char deptname[21];
if (scanf("%20s", deptname) != 1) {
return 1;
}
printf("%s\n", deptname);
FILE *payfile = fopen("c:\\class\\mod6\\ethan-pay.txt", "w");
if (!payfile) {
return 1;
}
for (int count = 0;; count++) {
printf("Enter employee #%d: ", count + 1);
char firstname[10];
char lastname[10];
if (scanf("%9s %9s", firstname, lastname) != 2) {
return 1;
}
char fullname[19];
sprintf(fullname, "%s %s", firstname, lastname);
printf("Enter the hourly wage of %s: ", fullname);
float hrwage;
if (scanf("%f", &hrwage) != 1) {
return 1;
}
printf("Enter total number of hours: ");
float hrsworked;
if (scanf("%f", &hrsworked) != 1) {
return 1;
}
if (hrsworked <= REGWORKWKHRS) {
float reghrsworked = hrsworked;
float othrsworked = 0;
float otwage = hrwage * OTPAYFACTOR;
float grosswage = hrwage * reghrsworked;
fprintf(stdout, "%-22s%0.1f ($%0.2f) %6.1f ($%0.2f) $%-4.2f\n", fullname,
reghrsworked, hrwage, othrsworked, otwage, grosswage);
} else {
float reghrsworked = REGWORKWKHRS;
float othrsworked = hrsworked - REGWORKWKHRS;
float otwage = hrwage * OTPAYFACTOR;
float grosswage = (reghrsworked * hrwage) + (othrsworked * otwage);
fprintf(stdout, "%-22s%0.1f ($%0.2f) %6.1f ($%0.2f) $%-4.2f\n", fullname,
reghrsworked, hrwage, othrsworked, otwage, grosswage);
}
printf("\nThank you. Process another employee? ");
char again;
if (scanf(" %c", &again) != 1) {
return 1;
}
if (again != 'Y' && again != 'y') {
break;
}
printf("\n");
}
fclose(payfile);
printf("End of processing.\n");
}
输入示例:
jurasickpark
sarah connor 5 42
y
bob lennon 9 12
n
输出文件:
sarah connor 40.0 ($5.00) 2.0 ($7.50) $215.00
bob lennon 12.0 ($9.00) 0.0 ($13.50) $108.00
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