Question

How to align columns in textual table with printf function in C

Answer 1

#include <stdio.h>

int main(void) {

    char *row1[] = {"idx", "cat", "num"};
    int col1[] = { 1, 2, 3 };
    char *col2[] = { "a", "bb", "ccc" };
    int col3[] = { 85487, 9473, 91 };

    printf("%*s | %*s | %*s\n", -3, row1[0], -8, row1[1], 7, row1[2]);
    printf("%*s | %*s | %*s\n", -3, "---", -8, "---", 7, "---");

    size_t len = sizeof col1 / sizeof col1[0];
    for (int i = 0; i < len; ++i) {
        printf("%-3d | %-8s | %7d\n", col1[i], col2[i], col3[i]);
    }

    return(0);
}





/*
run:

idx | cat      |     num
--- | ---      |     ---
1   | a        |   85487
2   | bb       |    9473
3   | ccc      |      91

*/

 

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