Question

So I have this exercise from my Coding class and we were tasked to input the user s input. However, we have to remove the comma of the last number of our output, and I m struggling with how to remove that comma. Can anyone please help?

这是我的法典。

#include <stdio.h>

#define MAX_SIZE 100 

int main(){
    int arr[MAX_SIZE];
    int N, i;
    int * ptr = arr;    
    
    printf("Enter length: ");
    scanf("%d", &N);

    for (i = 0; i < N; i++){
        printf("Enter element %d: ", i+1);
        scanf("%d", ptr);
        ptr++;   
    }

    ptr = arr;

    printf("[");
    for (i = 0; i < N; i++)
    {
        printf("%d,", *ptr);

        ptr++;
    }

        printf("]");

    return 0;
}

for convenience, this is the output I got

Enter length: 5
Enter element 1: 1
Enter element 2: 2
Enter element 3: 3
Enter element 4: 4
Enter element 5: 5
[1,2,3,4,5,]

这就是产出应如何

Enter length: 5
Enter element 1: 1
Enter element 2: 2
Enter element 3: 3
Enter element 4: 4
Enter element 5: 5
[1,2,3,4,5]

Answer 1

简单:

const char *sep = "";
printf( "[" );
for( i = 0; i < N; i++ ) {
    printf( "%s%d", sep, arr[ i ] );
    sep = ",";
}
printf( "]" );

Put the commas BEFORE the NEXT value being printed. Specify the "prefix" to be "", until that is changed to ",".

在整个过程中使用“记录索引”比改变点更合适。很容易忘记再利用它。

并且,增加一些代码,以核实scanf()已给未初始变量N指定了分类值! 如果用户类型four”回应第一种即时情况,那么N的价值就算不上了,哪怕是243,478,658...... 此外,该代码还应核对各用户类别120以填入“代码>100各部分。

在这种情况下(环绕的括号),我们甚至可以消除一条法典。

const char *sep = "[";
for( i = 0; i < N; i++ ) {
    printf( "%s%d", sep, arr[ i ] );
    sep = ",";
}
printf( "]" );

接着,通过改变周围的事物,请“蓝色-磷”

i = 0;
for( char pre =  [ ; i < N; pre =  ,  )
    printf( "%c%d", pre, arr[ i++ ] );
putchar(  ]  );

Answer 2

您可使用一个简单的ternary控制/printf,例如:

    for (i = 0; i < N; i++)
    {
        printf(i ? ",%d" : "%d", *ptr);

        ptr++;
    }

这只印出第1版后的数字。采用<代码>if-else的类似长式如下:

    for (i = 0; i < N; i++)
    {
        if (i) {
            printf(",%d", *ptr);
        }
        else {
            printf("%d", *ptr);
        }
        
        ptr++;
    }

Also suggest the final puts ("]"); to ensure your program is POSIX compliant -- outputting a final before program exit. Likewise, there is no need to call the variadic printf() function to output a single-character. A simple putchar ( [ ); will do.

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