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Код

#include <stdio.h>
#include <map>
using namespace std;

typedef map<double, int> Map;

extern "C"
{
void __stdcall proc1(const char* fileName)
{
    FILE* f = fopen(fileName, "r");
    if(!f)
    {
        printf("file not found\n");
        return;
    }
    Map m;
    for(;;)
    {
        double a;
        int b;
        if(fscanf(f, "%lf %d", &a, &b) < 2)
            break;
        pair<Map::iterator, bool> result = m.insert(pair<double, int>(a, b));
        if(!result.second)
            (result.first)->second += b;
    }
    fclose(f);

    char outFileName[264];
    strcpy(outFileName, fileName);
    strcat(outFileName, ".out");

    f = fopen(outFileName, "w");
    for(Map::iterator it = m.begin(); it != m.end(); ++it)
        fprintf(f, "%f %d\n", it->first, it->second);
    fclose(f);
}
}