C言語のsprintf()関数とsscanf()関数の目的は何ですか?

sscanf(string,formatspecifier,&var1,&var2,……..)

sprintf(string,format specifier,&var1,&var2…….);

#include<stdio.h>
int main(){
   char instring[]="Tutorials Point";
   char outstring[50],string1[10],string2[10];
   sscanf(instring,"%s %s",string1,string2);
   printf("%s</p><p>",string1);
   printf("%s",instring);
   return 0;
}

Tutorials
Tutorials Point

#include <stdio.h>
int main(){
   char value[50];
   int p = 20, q = 30, r;
   r= p + q;
   sprintf(value, "adding two numbers %d and %d the result is %d", p, q,r);
   printf("%s", value);
   return 0;
}

adding two numbers 20 and 30 the result is 50