我正在尝试编写一个程序,从用户输入中删除最后一个换行符,即用户输入字符串后按回车键时生成的换行符。
void func4()
{
char *string = malloc(sizeof(*string)*256); //Declare size of the string
printf("please enter a long string: ");
fgets(string, 256, stdin); //Get user input for string (Sahand)
printf("You entered: %s", string); //Prints the string
for(int i=0; i<256; i++) //In this loop I attempt to remove the newline generated when clicking enter
//when inputting the string earlier.
{
if((string[i] = '\n')) //If the current element is a newline character.
{
printf("Entered if statement. string[i] = %c and i = %d\n",string[i], i);
string[i] = 0;
break;
}
}
printf("%c",string[0]); //Printing to see what we have as the first position. This generates no output...
for(int i=0;i<sizeof(string);i++) //Printing the whole string. This generates the whole string except the first char...
{
printf("%c",string[i]);
}
printf("The string without newline character: %s", string); //And this generates nothing!
}
但它的行为并不像我想象的那样。这是输出:
please enter a long string: Sahand
You entered: Sahand
Entered if statement. string[i] =
and i = 0
ahand
The string without newline character:
Program ended with exit code: 0
问题:
'\n'
与第一个字符 'S'
匹配?printf("The string without newline character: %s", string);
根本不生成任何输出?条件
(string[i] = '\n')
将始终返回 true
。应该是(string[i] == '\n')
。
if((string[i] = '\n'))
这行可能是错误的,你是给 string[i] 赋值,而不是比较它。
if((string[i] == '\n'))
您可以使用 string.h 库中的 strlen() 命令来查找字符串的长度,然后将长度加 1 并将字符串的该元素设置为 0
#include <string.h>
name[strlen(name)+1] = '0';
strlen() 将返回输入字符串的长度,无论分配给它的内存量如何,并且将其值加 1 将使程序到达换行符的位置。