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- #include <stdio.h>
- #include <stdlib.h>
- int zbir(int n);
- int main()
- {
- int n, s;
- printf("Unesite prirodan broj\nn = ");
- do
- {
- scanf("%d", &n);
- if(n<1) printf("Unet broj nije prirodan!\nn = ");
- }while(n<1);
- s = zbir(n);
- printf("\nZbir prvih %d clanova niza iznosi %d\n", n, s);
- return 0;
- }
- int zbir(int n)
- {
- int i, s=0, br=3;
- for(i=1;i<=n;i++)
- {
- s+=br;
- br*=-2;
- }
- return s;
- }
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