#include<stdio.h>
#include<conio.h>
main()
{ int a=10;
int b=20;
 int c;
 do
 { printf("entrer le nombre\n");
 scanf("%d",&c);
 }
 while((a+b+c)<100);
{
 printf("la somme est %d\n",a+b+c);
 }
getch();
}

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