Open the buffer, such as
char buff[ 100]； //Suppose you don't have more than this many strings.
Yours is an array
char * * argv
Where argv[0] = "This is the first string";
Argv[ 1] = "This is the second string";
You just need to call the following
strcpy(buff，argv[0])；
strcpy(argv[0]，argv[ 1])；
strcpy(argv[ 1]，buff)；
Here is the complete code, and has been tested.
# include & ltstdio.h & gt
# include & ltstring.h & gt
Char argv[2][ 100]={ "This is the first string" and "This is the second string"};
//Stores a two-dimensional array of strings, and the maximum length of each string is 99 bytes.
char buff[ 100]；
//buffer
int main()
{
Printf ("Before conversion: \ n");
printf("argv[0] = %s\n "，argv[0])；
printf("argv[ 1] = %s\n "，argv[ 1])；
strcpy(buff，argv[0])；
strcpy(argv[0]，argv[ 1])；
strcpy(argv[ 1]，buff)；
Printf ("after conversion: \ n");
printf("argv[0] = %s\n "，argv[0])；
printf("argv[ 1] = %s\n "，argv[ 1])；
Returns 0;
}