Question

我在这里编写了一个脚本，但在执行do-while循环时遇到了麻烦。我可以使它无限运行（继续）或仅运行一次（中断）。我所设定的条件可能有问题...我在这里很茫然，因此任何帮助将不胜感激

#include <stdio.h>
#include <time.h>

int main ()
{
    int age;
    char string[50];
    char string2[4];
    int yearsleft;

    /*
    FILE *fp;


    fp = fopen( "RetireeFileForCo.txt", "a+" );

    */

    do {

        printf( "What is your name? \n");

        scanf( "%s", string );

        printf( "Hello %s\n", string );


        printf ("What is your age? \n");

        scanf ("%d", &age);

        printf ("You enter %d\n", age );


        if ( age  > 65 ) {

            printf (".... You should already be retired %s\n", string );

//  fputs ( ".... You should already be retired %s\n", fp, string );


        } else {
            yearsleft = 65 - age ;
            printf ("Your number of years left until retirement is  %d\n", yearsleft);
        }

        /*
        fputs ( "As of the date above.... You should already be retired %s\n",       fp );}}


        fclose (fp);
        */
        printf( "Do you want to check another person's status? (yes or no) \n");

        scanf( "%s", string2 );
        if("string2 = yes") {
            continue;
        }
        printf ("Thank you for your input\n");
    }
    while("string2 = yes");
    return 0;
}

Answer 1

语句if ( "string2 = yes" )和while ( "string2 = yes" )确实是问题所在。 "string2 = yes"只是一个字符串，在如上所述的布尔上下文中，其值为true（或更准确地说，为not false）。

要比较字符串值，必须使用库函数strcmp（没有为字符串或任何其他数组表达式定义=赋值或==比较运算符）：

if ( strcmp( string2, "yes" ) == 0 ) // strcmp returns 0 if the arguments are equal
{
  // do something if string2 is equal to yes
}

do
{
  // loop at least once, repeat if string2 is equal to "yes"
} while( strcmp( string2, "yes" ) == 0 );

您也可以将它们写为if ( !strcmp( string2, "yes" ) )和while ( !strcmp( string2, "yes" ) )。

我是C语言的新手，但确实可以在项目上使用一些帮助

1 个答案: