c - Modifying the array element in called function -

i trying understanding passing of string called function , modifying elements of array inside called function.

void foo(char p[]){   p[0] = 'a';   printf("%s",p); } void main(){   char p[] = "jkahsdkjs";   p[0] = 'a';   printf("%s",p);   foo("fgfgf"); } 

above code returns exception. know string in c immutable, know there difference between modifying in main , modifying calling function. happens in case of other date types?

i know string in c immutable

that's not true. correct version is: modifying string literals in c undefined behaviors.

in main(), defined string as:

char p[] = "jkahsdkjs"; 

which non-literal character array, can modify it. passed foo "fgfgf", string literal.

change to:

char str[] = "fgfgf"; foo(str); 

would fine.