#include <stdlib.h>
#include <stdio.h>

int vecInput(int vec[]) {
    printf("size of vector? ");
    int vec_size = 0;
    scanf("%d", &vec_size);
    if(vec_size < 1) {
        printf("Incorrect size of vector = %d\n", vec_size);
        exit(1);
    }

    for(int i = 0; i < vec_size; i++) {
        printf("[%d]? ", i);
        scanf("%d", vec+i);
    }
    return vec_size;
}

int  vecSum(int vec[], int vec_size) {
    int sum = 0;
    for(int i = 0; i < vec_size; i++) {
        sum += vec[i];
    }
    return sum;
}

int main() {
    int vec[100];
    int size = vecInput(vec);
    
    printf("Summa = %d\n", vecSum(vec, size));
    return 0;
}