C Programming Code Examples
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C program to remove first occurrence of a word from string
/* C program to remove first occurrence of a word from string
Write a C program to input any string from user and remove first occurrence of a given word from string. Write a function to remove first occurrence of a word from the string. How to remove first occurrence of a word from the string in C programming. Logic to remove first occurrence of a word from given string.
Logic to remove first occurrence of a word
Input string from user, store it in some variable say str.
Input word to be searched from user, store it in some other variable say word.
Run a loop from start of the string str to end.
Inside loop, for each character in word match rest of characters with str. If all characters in word matched to str, then proceed to next step.
If a word match is found then, shift all characters from current match position to left. */
#include <stdio.h>
#include <string.h>
#define maxsize 100 // Maximum string size
/** Function declaration */
void removeFirst(char * str, const char * toRemove);
int main()
{
char str[maxsize];
char toRemove[maxsize];
/* Input string and word to be removed from user */
printf("Enter any string: ");
gets(str);
printf("Enter string to be removed: ");
gets(toRemove);
removeFirst(str, toRemove);
printf("\nString after removing '%s': \n%s", toRemove, str);
return 0;
}
/* Remove first occurrence of a word from string */
void removeFirst(char * str, const char * toRemove)
{
int x, j;
int len, removeLen;
int found = 0;
len = strlen(str);
removeLen = strlen(toRemove);
for(x=0; x<len; x++)
{
found = 1;
for(j=0; j<removeLen; j++)
{
if(str[x+j] != toRemove[j])
{
found = 0;
break;
}
}
/* If word has been found then remove it by shifting characters */
if(found == 1)
{
for(j=x; j<=len-removeLen; j++)
{
str[j] = str[j + removeLen];
}
// Terminate from loop so only first occurrence is removed
break;
}
}
}
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