K & R C Programs Exercise 4-1.

K and R C, Solution to Exercise 4-1:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C program which returns the position of the occurrence of sub string t in string s, or -1 if there is none.

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#include<stdio.h>
#include<conio.h>
void main()
{
int flag=0;
char str[80],search[10];
puts("Enter a string:");
gets(str);

puts("Enter search substring:");
gets(search);
flag=strindex(str, search);
if (flag == -1)
{
printf("SEARCH UNSUCCESSFUL! AND POSITION IS:%d",flag);
}
else{
printf("SEARCH SUCCESSFUL! AND POSITION IS:%d",flag);
}
getch();
}

//strindex: returns the right most index of t in s, -1 if none*/
int strindex(char s[], char t[])
{
int k,i,j,pos;
pos = -1;
for(i=0;s[i] != ''; i++)
{
for(j=i, k = 0; t[k] != '' && s[j] == t[k]; j++, k++)
;
if (k > 0 && t[k] == '')
pos=i;
}
return pos;
}
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