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#include <stdio.h> int main(void) { FILE *fp; int ch; char filename[FILENAME_MAX]; printf("filename: "); scanf("%s", filename); if((fp = fopen(filename, "r")) == NULL) printf("afile open failed. "); else { int num = 0; while((ch = fgetc(fp)) != EOF) { if(ch != ' ') num++; } fclose(fp); printf("characters number is: %d ", num); } return 0; }