C Exercises: Get the column number that corresponds to a column title as appear in an Excel sheet

C Programming Mathematics: Exercise-9 with Solution

Write a C program to get the column number (integer value) that corresponds to a column title as it appears in an Excel sheet.

For example:
A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
...

Example:
Input:
col_title1[ ] ="C"
col_title2[ ] ="AC"
col_title3[ ] ="ZY"
Output:
Corresponding number: 3
Corresponding number: 29
Corresponding number: 701

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>

 int excel_title_to_Number(char* s) {
    int k = 0;
    while (s && *s) {
        k = k * 26 + (*s) - 'A' + 1;
        s ++;
    }
    return k;
}

int main(void)
{
    char col_title1[ ] ="C";
    printf("\nExcel column title: = %s", col_title1);
    printf("\nCorresponding number: %d ",excel_title_to_Number(col_title1));
    char col_title2[ ] ="AC";
    printf("\n\nExcel column title: = %s", col_title2);
    printf("\nCorresponding number: %d ",excel_title_to_Number(col_title2));
    char col_title3[ ] ="ZY";
    printf("\n\nExcel column title: = %s", col_title3);
    printf("\nCorresponding number: %d ",excel_title_to_Number(col_title3));
    return 0;
}

Sample Output:

Excel column title: = C
Corresponding number: 3 

Excel column title: = AC
Corresponding number: 29 

Excel column title: = ZY
Corresponding number: 701 

Flowchart:

C Programming Code Editor:

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