In this article, we will show you, How to write a C Program to Replace First Occurrence of a Character in a String with example.
C Program to Replace First Occurrence of a Character in a String Example 1
This program allows the user to enter a string (or character array), and a character value. Next, it will search and replace the first occurrence of a character inside a string.
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/* C Program to Replace First Occurrence of a Character in a String */ #include <stdio.h> #include <string.h> int main() { char str[100], ch, Newch; int i; printf("\n Please Enter any String : "); gets(str); printf("\n Please Enter the Character that you want to Replace : "); scanf("%c", &ch); getchar(); printf("\n Please Enter the New Character : "); scanf("%c", &Newch); for(i = 0; str[i] != '\0'; i++) { if(str[i] == ch) { str[i] = Newch; break; } } printf("\n The Final String after Replacing First occurrence of '%c' with '%c' = %s ", ch, Newch, str); return 0; } |
OUTPUT
ANALYSIS
First we used For Loop to iterate each and every character in a String.
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for(i = 0; i <= strlen(str); i++) { if(str[i] == ch) { str[i] = Newch; break; } } |
str[] = Hello World
ch = l
Newch = @
For Loop First Iteration: for(i = 0; i <= strlen(str); i++)
Within the While Loop we used If Statement to check whether the str[0] is equal to user specified character or not
if(str[i] == ch) => if(H == l)
Above condition is false. So, i value will be incremented, and Flag is still 0.
Second Iteration: for(i = 1; 1 <= 11; 1++)
if(str[i] == ch) => if(e == l)
Above condition is false. So, i value will be incremented, and Flag is still 0.
Third Iteration: for(i = 2; 2 <= 11; 2++)
if(str[i] == ch) => if(l == l)
Above condition is True.
str[i] = Newch
str[2] = @
and, break statement will exit from the loop
Next, we used the printf statement to print the final string.
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printf("\n The Final String after Replacing First occurrence of '%c' with '%c' = %s ", ch, Newch, str); |
C Program to Replace First Occurrence of a Character in a String Example 2
This program is same as above. Here, we just replaced the For Lop with While Loop. I suggest you to refer While Loop to understand the Loop iterations.
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/* C Program to Replace First Occurrence of a Character in a String */ #include <stdio.h> #include <string.h> int main() { char str[100], ch, Newch; int i = 0; printf("\n Please Enter any String : "); gets(str); printf("\n Please Enter the Character that you want to Replace : "); scanf("%c", &ch); getchar(); printf("\n Please Enter the New Character : "); scanf("%c", &Newch); while(i <= strlen(str)) { if(str[i] == ch) { str[i] = Newch; break; } i++; } printf("\n The Final String after Replacing First occurrence of '%c' with '%c' = %s ", ch, Newch, str); return 0; } |
OUTPUT
C Program to Replace First Occurrence of a Character in a String Example 3
This program is same as first example but this time we used the Functions concept to separate the logic.
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/* C Program to Replace First Occurrence of a Character in a String */ #include <stdio.h> #include <string.h> void Replace_FirstOccurrence(char *str, char ch, char Newch); int main() { char str[100], ch, Newch; int i = 0; printf("\n Please Enter any String : "); gets(str); printf("\n Please Enter the Character that you want to Replace : "); scanf("%c", &ch); getchar(); printf("\n Please Enter the New Character : "); scanf("%c", &Newch); Replace_FirstOccurrence(str, ch, Newch); printf("\n The Final String after Replacing First occurrence of '%c' with '%c' = %s ", ch, Newch, str); return 0; } void Replace_FirstOccurrence(char *str, char ch, char Newch) { int i; for(i = 0; str[i] != '\0'; i++) { if(str[i] == ch) { str[i] = Newch; break; } } } |
OUTPUT
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