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- #include <stdio.h>
- int sum(int n);
- int main()
- {
- int number, result;
- printf("Enter a positive integer: ");
- scanf("%d", &number);
- result = sum(number);
- printf("sum=%d", result);
- }
- int sum(int num)
- {
- if (num!=0)
- return num + sum(num-1); // sum() function calls itself
- else
- return num;
- }
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