How to find index of given character of string in the other string in c?

Question

char string[5][5]={{'a','l','p','h','b'},{'c','d','e','f','g'},
                   {'i','j','k','m','n'},{'o','q','r','s','t'},
                   {'u','v','w','x','y'}};
char strsearch[100];
int rowindex[100];
int colindex[100];
printf("\nEnter String=");
gets(strsearch);
int iIndex,jIndex=0;
int count=0;
int row,column=0; 
for(row=0;row<5;row++)
    {
        for(column=0;column<5;column++)
            {
                if(string[row][column]==strsearch[i])
                    {
                        rowindex[iIndex]=row;
                        colindex[jIndex]=column;
                        iIndex++;
                        jIndex++;
                        count++;
                        i++;
                        //printf("%d",count);
                    }
            }
    }

for(iIndex=0;iIndex<count;iIndex++)
    {
        printf("row=%d",rowindex[iIndex]);
        printf("\ncol=%d",colindex[iIndex]);
    }

I have done like above expected output should be as below. Output should be:

    Enter String=mona
    row=2,3,2,0 //index of row of character 'm','o','n','a'
    column=3,0,4,0 ////index of column of character 'm','o','n','a'

But it does not print anything. What is wrong in this?.

`iIndex` is not initialized in the first loop, so your program probably crashes. — Sergey Kalinichenko, Aug 17 '17 at 03:37
[Don't use the unsafe gets() function ever](https://stackoverflow.com/questions/1694036/why-is-the-gets-function-so-dangerous-that-it-should-not-be-used) — ad absurdum, Aug 17 '17 at 03:38
post full code. There are so many errors. Use compiler flags and look into warnings. — MCG, Aug 17 '17 at 03:44
Also You need outer loop. like `for(int i = 0; strsearch[i] ; ++i){ ... }` or reset search position. — BLUEPIXY, Aug 17 '17 at 03:45
These are not strings since they are not null terminated. The gets() function is removed from the language. You need a better source of learning C. — Lundin, Aug 17 '17 at 06:28

adamyi · Accepted Answer · 2017-08-17T04:56:53.837

Try this.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

char string[5][5]={{'a','l','p','h','b'},{'c','d','e','f','g'},
    {'i','j','k','m','n'},{'o','q','r','s','t'},
    {'u','v','w','x','y'}};
char strsearch[100];
int rowindex[100];
int colindex[100];

int main(int argc, const char *argv[])
{
    printf("\nEnter String=");
    gets(strsearch);
    int count = 0;
    for (int i = 0; i < strlen(strsearch); i++) {
        for(int row = 0; row < 5; row++)
        {
            for(int column = 0; column < 5; column++)
            {
                if(string[row][column] == strsearch[i])
                {
                    rowindex[count] = row;
                    colindex[count++] = column;
                }
            }
        }
    }

    printf("row");
    char prefix = '=';
    for(int i = 0; i < count; i++)
    {
        printf("%c%d", prefix, rowindex[i]);
        prefix = ',';
    }


    printf("\ncolumn");
    prefix = '=';
    for(int i = 0; i < count; i++)
    {
        printf("%c%d", prefix, colindex[i]);
        prefix = ',';
    }
    printf("\n");

    return 0;
}

How to find index of given character of string in the other string in c?

1 Answers1