[英]In C, how to print a string from a multidimensional array?
I have the following program to take five user entered names and print them out. 我有以下程序来取五个用户输入的名称并打印出来。
I need to ask for each name one by one, then prompt the user to either print the list of names or add another name to the list. 我需要逐个询问每个名称,然后提示用户打印名称列表或在列表中添加其他名称。 The names must be stored in a two dimensional array, though I don't see why it couldn't be done with a regular array.
名称必须存储在二维数组中,但我不明白为什么不能使用常规数组。
My code accepts the names with no issues, but fails to print anything. 我的代码接受没有问题的名称,但无法打印任何内容。 It includes print tests to monitor where the error happens.
它包括用于监视错误发生位置的打印测试。 Test number 6 does not print, so there must be an issue with
printf("Name: %s", names[x][y]);
测试编号6不打印,因此
printf("Name: %s", names[x][y]);
必须存在问题printf("Name: %s", names[x][y]);
What is the error? 错误是什么?
#include <stdio.h>
int main() {
int x;
int y;
char names[5][51] = {{'\0'},{'\0'}};
printf("Enter the names: ");
for (x = 0; x <5; x++) {
printf("\nPrintTest 1");
for (y = 0; y < 1; y++) {
printf("\nPrintTest 2");
scanf("%50s",&names[x][y]);
}
}
printf("\nPrintTest 3");
for (x = 0; x < 5; x++) {
printf("\nPrintTest 4");
for (y = 0; y < 1; y++) {
printf("\nPrintTest 5");
printf("Name: %s", names[x][y]);
printf("\nPrintTest 6");
}
}
}
You do not need the nested loop on y
: 你不需要
y
上的嵌套循环:
char names[5][51];
printf("Enter the names: ");
for (int x = 0; x <5; x++) {
printf("\nPrintTest 1");
scanf("%50s", names[x]);
printf("\nPrintTest 2");
}
printf("\nPrintTest 3");
for (int x = 0; x < 5; x++) {
printf("\nPrintTest 4");
printf("Name: %s\n", names[x]);
printf("\nPrintTest 5");
}
printf("\nDone.\n");
So here's my analysis 所以这是我的分析
Your Mistake: 你的错误:
In fact you declared a 2D array
where each xth
index is basically the char*
. 实际上你声明了一个
2D array
,其中每个xth
索引基本上都是char*
。
names[x]
, it will get the char*
pointer at the xth
element of names
. names[x]
,它将在names
的xth
元素处获取char*
指针。 names[x][y]
it will get the pointer at the xth
element and then will access it's yth
element which is a character and a character datatype is printed by %c
not by %s
. names[x][y]
,它将获得指向第xth
元素的指针,然后将访问它的yth
元素,该元素是一个字符,而字符数据类型由%c
打印,而不是由%s
打印。 Possible Solution: 可能解决方案
If you want to print the arrays character by character, then you need to iterate the inner loop over the size of array which is 51 in your case, and then you can print the array by using %c
instead of %s
. 如果你想逐个字符地打印数组,那么你需要在你的情况下迭代数组大小为51的内部循环,然后你可以使用
%c
而不是%s
来打印数组。
Or you can print the whole array using %s
but in that case inner loop is not required because you will be printing the whole array at a time. 或者您可以使用
%s
打印整个数组, 但在这种情况下不需要内部循环,因为您将一次打印整个数组。
Updated Code: 更新的代码:
Method # 01: 方法#01:
//Iterating over all the char*
for (x = 0; x < 5; x++)
{
printf("\nPrintTest 4");
//Use of inner loop - Printing the arrays character by character
for (y = 0; y < 51; y++)
{
printf("\nPrintTest 5");
printf("Name: %c", names[x][y]);
printf("\nPrintTest 6");
}
}
Method # 02: 方法#02:
//Iterating over all the char*
for (x = 0; x < 5; x++)
{
printf("\nPrintTest 4");
//Printing the arrays without the loop
printf("\nPrintTest 5");
printf("Name: %s", names[x]);
printf("\nPrintTest 6");
}
Hope its clear now. 希望现在清楚。
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