EXERCISE-7

1. Write a program in C to search an element in a row wise and column wise sorted matrix.
SOURCE CODE:
#include<stdio.h>
int main(){
    int mtrx[10][10], r, c, i, j, ele;
    printf("Enter matrix size:");
    scanf("%d%d",&r,&c);
    printf("Enter %d X %d matrix elements:\n",r,c);
    for(i=0;i<r;i++)
        for(j=0;j<c;j++)
            scanf("%d",&mtrx[i][j]);
    printf("Enter search element:");
    scanf("%d",&ele);
    for(i=0;i<r;i++){
        for(j=0;j<c;j++){
            if(mtrx[i][j]==ele)
                break;
        }
        if(j!=c)
            break;
    }
    if(i!=r && j!=c)
        printf("%d element is found at %d-row and %d-column.\n",ele,i,j);
    else
        printf("%d element is not found.\n",ele);
}

OUTPUT:

Enter matrix size:3 3

Enter 3 X 3 matrix elements:

1 2 3

4 5 6

7 8 9

Enter search element:5

5 element is found at 1-row and 1-column.

2. Write a program in C to print individual characters of string in reverse order.
SOURCE CODE:
#include<stdio.h>
#include<string.h>
int main(){
    char str[50];
    int i,len;
    printf("Enter string:\n");
    gets(str);
    len = strlen(str);
    printf("String in reverse order:\n");
    for(i=len-1;i>=0;i--)
        printf("%c",str[i]);
    return 0;
}
OUTPUT:
Enter string:
hello world
String in reverse order:
dlrow olleh