#include#include #include int main(){FILE *fp;int i=0,j,s=0,flag=0,b[100];float ave;if((fp=fopen("data.in","r"))==NULL){return 1;} char str[100];while(fscanf(fp,"%s",str)!=EOF){if(!isdigit(atoi(str))){return 2;}else{b[i++]=atoi(str);}}for(j=0;j<i;j++){s=s+b[j];}ave=...
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