Enter a string at run time and read a character to replace at console. Then, finally read a new character that has to be placed in place of an old character where ever it occurs inside the string.
Program1
Following is the C program to replace all occurrence of a character −
#include <stdio.h> #include <string.h> int main(){ char string[100], ch1, ch2; int i; printf("enter a string : "); gets(string); printf("enter a character to search : "); scanf("%c", &ch1); getchar(); printf("enter a char to replace in place of old : "); scanf("%c", &ch2); for(i = 0; i <= strlen(string); i++){ if(string[i] == ch1){ string[i] = ch2; } } printf("\n the string after replace of '%c' with '%c' = %s ", ch1, ch2, string); return 0; }
Output
When the above program is executed, it produces the following result −
enter a string: Tutorials Point enter a character to search: i enter a char to replace in place of old: % the string after replace of 'i' with '%' = Tutor%als Po%nt enter a string: c programming enter a character to search: m enter a char to replace in place of old: $ the string after replace of 'm' with '$' = c progra$$ing
Program2
Following is the C program to replace at first occurrence −
#include <stdio.h> #include <string.h> int main(){ char string[100], ch1, ch2; int i; printf("enter a string : "); gets(string); printf("enter a character to search : "); scanf("%c", &ch1); getchar(); printf("enter a char to replace in place of old : "); scanf("%c", &ch2); for(i = 0; string[i]!='\0'; i++){ if(string[i] == ch1){ string[i] = ch2; break; } } printf("\n the string after replace of '%c' with '%c' = %s ", ch1, ch2, string); return 0; }
Output
When the above program is executed, it produces the following result −
Run 1: enter a string: Tutorial Point enter a character to search: o enter a char to replace in place of old: # the string after replace of 'o' with '#' = Tut#rial Point Run 2: enter a string: c programming enter a character to search: g enter a char to replace in place of old: @ the string after replace of 'g' with '@' = c pro@ramming