How to left align text in C language?

In C language, the common method of left-aligning is achieved through the format specifier of the printf function. The specific method involves using the format “%-ns”, where n is the output field width and s is the string to be output.

Here is a sample code:

#include <stdio.h>

int main() {
    char str[] = "Hello, World!";
    int width = 20; // 输出字段宽度

    printf("%-*s\n", width, str);

    return 0;
}

The output results are:

Hello, World!       

The output string is left-aligned and occupies a specified width. If the length of the string exceeds the specified width, the output will be truncated based on the actual length of the string.