C Reference String Operation: strchr()
The function strchr() returns a pointer to the first occurrence of x in a string.
Usage:
char *strchr( const *str, int x);
Note: NULL will be returned if x isn’t found.
strchr() source code example:
#include<stdio.h>
#include<string.h>
main()
{
char line[100];
char *ptr_my;
printf("Input word:");
scanf("%s", line);
ptr_my=strchr(line, 'a');
if (ptr_my == NULL)
printf("Character a is not found.\n");
else
printf("Character found at position %d\n", ptr_my - line+1);
}
Output of the example:
Input word:testen
Character a is not found.
Input word:tastan
Character found at position 2
Note: the program was executed two times to get the result of the output example.
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The function main() should either be type void or int and a return value. So I added:
int main ()
{
…
return 0;
}
I’m on Ubuntu natty, with AMD64 cpu, when compiling with: gcc -Wall -o string1 string1.c
I get:
string1.c: In function ‘main’:
string1.c:25:2: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long int’