Answered: Write a function that gets two strings,…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write a function that gets two strings, str1 and str2, and searches for str2 inside str1, and returns the index of the first appearance of str2 in str1. If str is not in str, the

function returns -1. For example:

- str_find("Hello world", "llo") should return 2.

- str_find("ABCDEFD", "DE") should return 3.

- str_find("ABCDEFD", "BCF") should return -1.

// finds the first appearance of str in str1

// returns the index of the beginning of the first appearance

// if str2 is not in str1, returns -1

int str_find(const char* str1, const char* str2);

Test for the Function:

void test_q1() {

intans1 = str_find("Hello world", "llo");

if (ans1 == 2)

printf("Q1-1 ok\n");

else

printf("Q1-1 ERROR\n");

intans2 = str_find("ABCDEFG", "BCF");

if (ans2 == -1)

printf("Q1-2 ok\n");

else

printf("Q1-2 ERROR\n");

}

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